
Review
Review: Satisfyer Men Heat Vibration
Same series, but with a motor and heat function.
29 July 2026

Review · Masturbator · Manual pressure regulation
Satisfyer’s simplest masturbator reviewed against the manufacturer’s own specifications and price data from eight Swedish stores. Fully manual operation without a battery, an internal pressure regulator that adjusts the tightness, a replaceable sleeve in TPE, IPX7 according to IEC 60529, and 15-year warranty — at a price that differs by 100 percent between the cheapest and the most expensive store.
A completely manual masturbator that does one thing: lets you pump to set how tight the channel should be. What speaks for it is the lack of electronics—no battery that dies, nothing to charge, IPX7 without reservations, and a 15-year warranty—plus the manufacturer sells six interchangeable sleeves for the same housing. What speaks against it is that the contact surface is TPE rather than silicone, that no phthalate-free declaration is published, and that Satisfyer Men Vibration costs less at Swedish stores and has a motor.
Satisfyer Men One is the brand’s simplest masturbator, and at the same time the only one in the Men series that has absolutely no electronics. There is no motor, no button, no battery, and no charging cable. What drives the product is a pump with an internal pressure regulator: you press a button on the casing, air is moved in the chamber around the sleeve, and the sleeve’s inner channel becomes narrower or wider. That’s the entire operating principle, and it’s also what differentiates it from an entirely passive sleeve.
The manufacturer’s specification looks like this: height 250 millimeters, length 85 millimeters, width 72 millimeters, weight 550 grams, enclosure rating IPX7, the colors black and blue, and a 15-year manufacturer’s warranty. The material is listed in the feature table as ABS plastic and silicone, but the manufacturer’s own user manual lists four materials — silicone, ABS, TPU, and TPE — and that difference is more important than it looks, which we’ll come back to. In Sweden, the item is sold by eight retailers at prices between 299 and 599 SEK, and six of them have it in stock.
This review is about the item with EAN 4049369015887, which is Satisfyer Men One in the black-blue version. The retailers list it under at least five different names — "Satisfyer Men", "Satisfyer Men One Masturbator", "Satisfyer Men Stroker", "Satisfyer Men One Realistisk Masturbator" and "Masturbator – Satisfyer Men" — which makes the name a poor search term and the EAN number a good one. Check the number before comparing prices, because Satisfyer has a number of other products with the word Men in the name: Men Classic, Men Vibration, Men Heat Vibration, and Men Wand are just a few of them.
The manufacturer states plainly that Men One works entirely without batteries or accumulators. It’s an unusual feature in this price range, and the consequences go both ways. The advantage is purely a matter of principle: the most common reason an intimate product becomes unusable is that a fixed-on lithium-ion battery loses capacity after a few hundred charging cycles. That source of error simply isn’t present here. There’s no charging cable to misplace, no charging port to keep dry, and no time to wait for something to become fully charged.
The downside is equally a matter of principle. Without a motor there’s no vibration, no heat, and no automatic movement—all movement comes from your hand. So what the pump contributes isn’t stimulation, but fit: it changes how tight the canal is, not what happens in it. Several of the reviews in the manufacturer’s own web shop are about exactly this misunderstanding, and it’s worth taking seriously before you order. If you expect something that does the job for you, Men One is the wrong product—and that shows in the rating.
What can be established purely from a technical perspective is that the lack of electronics also explains two other lines in the specification. IPX7 is easier to achieve when there’s no electrical component running through the housing, and a 15-year warranty is cheaper to promise on a product that doesn’t contain a single component that ages on its own. Both claims are correct, but here they matter less than they would for a product with a motor.
Satisfyer’s naming in the Men series is harder to keep straight than for most others, because the model names describe functions rather than generations. Three models are close together in price and are regularly mixed up in Swedish shops.
So the difference between Men One and Men Classic isn’t technical, but dimensional and material: Classic is longer, wider, heavier, and has no silicone in the housing. The difference versus Men Vibration, however, is fundamental—there’s a motor there. If you want vibration, don’t buy Men One, and it doesn’t matter how much cheaper it is.
The material question is the single most important feature of an intimate product, because it determines whether the product can still be cleaned after two years. There’s also a concrete reason to read carefully: the manufacturer lists two different material lists in two different places, and the complete list isn’t where most people read it.
The property table on the product page states "ABS plastic, Silicone". The quick start guide, which is provided as a downloadable PDF on the same page, instead states "Material: Silicone, ABS, TPU, TPE" on all the languages in the booklet. This isn’t a contradiction but a simplification: the property table lists the two materials that make up the actual housing, while the user manual lists everything included in the delivered product. TPE is the sleeve.
That TPE is the sleeve material can be verified without guessing. The manufacturer sells six replacement sleeves that are expressly stated to fit Men One, and for each individual sleeve — for example Tornado Bliss — the material is listed as TPE, directly. The same sleeves are described in the marketing text as "super soft cyberskin-material". Cyberskin is therefore not a material but a product name, and the material that the product name refers to is TPE.
This is the most important line in the entire review. The surface that actually comes into contact with the skin is TPE, not silicone. The silicone sits on the sides of the housing like a ribbed grip, and the ABS plastic makes up the top and bottom of the shell. What’s marketed as a silicone product is, in practice, a silicone-coated shell around a TPE sleeve, and a buyer who goes by the line "Material: ABS plastic, Silicone" will be surprised.
The difference comes down to the structure. Silicone is non-porous: there are no microscopic cavities in the surface where residue can get left behind, and that’s why a silicone surface can be cleaned. Thermoplastic elastomers like TPE are soft because a rubber-like phase is mixed with a thermoplastic, and the surface is therefore not non-porous in the same way. In a masturbator, where the surface also sits inside a narrow channel that’s hard to access and hard to dry, there’s a real practical difference — not a theoretical one.
That doesn’t mean TPE is unsuitable. Almost the entire masturbator category is built on soft thermoplastics, for the simple reason that silicone can’t provide the same stretchability and non-slip feel in a thin sleeve. But in practice, it means three things: the sleeve must be cleaned more carefully and dried properly, it shouldn’t be shared between people, and it’s a consumable part rather than a lifetime part. The fact that the manufacturer sells six different replacement sleeves for 207,95 SEK each in itself indicates how the product is intended to be used.
Phthalates are a group of plasticizers used to make plastic flexible. The Swedish Chemicals Agency describes them as substances that can affect the endocrine system and make reproduction more difficult, and several of them are restricted or banned within the EU. This product category is exactly where the question is most relevant, because it contains soft plastic that sits directly against the mucous membrane for longer periods of time.
Satisfyer does not publish any phthalate-free, BPA-free, or latex-free declaration for Men One. Neither the product page nor the quick start guide contains any of those words. That is not the same as saying the product would contain phthalates—EU legislation applies regardless of what a manufacturer writes on its website—but it is a clear difference compared with several competing brands, which state that commitment. On a product whose contact surface is TPE, an explicit material declaration would have been more valuable than on an all-silicone product, because it is precisely in soft thermoplastics that the question of plasticizers arises.
What the instructions for use, however, state is a set of specific safety instructions: remove piercings and jewelry in the intimate area before use, do not use the product on irritated or damaged skin, stop if it hurts, and do not use the product if it is damaged, deformed, or discolored. The last point is worth remembering—discoloration in a TPE sleeve is a sign that the material has started to break down, and the manufacturer explicitly treats it as a disposal criterion.
The manufacturer’s specification table states a height of 250 millimeters, a length of 85 millimeters, and a width of 72 millimeters. The labels are confusing—what is called height is the product’s long axis—but the size order is unambiguous: a cylindrical casing at just under a quarter of a meter with a widest cross-section of just under nine centimeters. The weight is given as 550 grams.
Unlike many weight specifications in this category, this one can be checked against the manufacturer’s own figures. The replacement sleeve, Tornado Bliss, is stated to weigh 302 grams and measure 217.3 × 66 × 78.6 millimeters. The sleeve therefore accounts for a little more than half of the total weight and fills almost the entire length of the casing, which makes 550 grams a reasonable product weight rather than a shipping weight. What still isn’t clear is whether the 550 grams refers to the product with or without packaging, and Satisfyer publishes no separate net weight.
550 grams is noticeably in the hand. Compare it with Satisfyer Men Vibration, which weighs 295 grams, and the heavier Men Classic at 699 grams. The weight is a direct consequence of the design: a solid TPE sleeve at this size weighs what it weighs, and the casing has to hold up to being gripped tightly. For anyone who wants something to take on a trip, a half-kilo product at 25 centimeters is a deliberate choice, not a given—even though the practical cover means it can at least be packed without getting dirty.
The manufacturer does not publish the sleeve’s internal channel length, the channel’s diameter, or any recommended maximum circumference. It’s a real gap in the specifications for this product type, because fit is crucial and because the sleeve’s external dimensions, 217.3 millimeters, don’t say anything about how far into the channel it goes. If you have clearly large or small measurements, it’s a task you need to look up in store descriptions or in other users’ descriptions, not at Satisfyer.
The interface on Satisfyer Men One consists of just one thing: a pump button on the housing. The manufacturer describes the function as an innovative internal pressure regulator that creates a varying suction effect, and as a pump function for regulating tightness. It’s therefore the same mechanism described in two ways—the pressure in the chamber around the sleeve determines both how tightly the sleeve seals in and how much negative pressure is created when you pull.
Simplicity is the product’s most obvious trait. There’s nothing to learn, nothing to set up in advance, and nothing that can stop responding. On the other hand, there’s also nothing to adjust beyond the single parameter. Where a motorized model like Satisfyer Men Vibration has settings you can scroll through, Men One has a scale that goes from loose to tight, and the rest is determined by how you use it.
By pumping. The manufacturer states that the internal regulator creates a stronger or weaker vacuum depending on how much you pump, and that’s how you adjust the masturbator’s internal size. The marketing graphics in the product gallery phrase it as "innovative pump feature to regulate the tightness".
What can be established is that it makes the product adjustable in a dimension where most sleeves are fixed: the same product can be set loose for a longer time and tight for a shorter time. What can also be established is that the effect is limited by physics—a pump that works against an air chamber can only change the sleeve’s contact as much as the channel will allow before the channel fully closes, and the manufacturer publishes no measurement of how large the adjustment range is in millimeters or in pressure. So there’s no figure here you can compare against a competitor—only a description of how the function works.
A practical consequence that’s easy to miss: because the pump works with air, the system depends on the sleeve being fitted correctly into the housing. If the sleeve is inserted at an angle or not fully seated down, the chamber seals less well, and then pumping is less effective. It’s the same thing that makes reassembly after cleaning something worth taking the time for.
The fact that the sleeve can be changed is the feature that separates Men One most from a simple disposable sleeve, and it’s also easy to verify. Satisfyer sells six different masturbator inserts — Tornado Bliss, Kinky Waves, Pressure Spiral, Chambers of Pleasure, Lusty Tongues and Tri Delights — all for 207.95 SEK in the manufacturer’s own web shop, and the product page for Tornado Bliss expressly states that it is an insert for the Satisfyer Men One.
That means two things. The first is that the structure in the channel is replaceable: Tornado Bliss is described by the manufacturer as spiral-shaped ridges in the first third, followed by small bumps further in, and the other five each have their own patterns. So you buy one housing once and can then change the experience for a third of the product’s price. The second is that the sleeve is a replacement part even when it isn’t replaced out of desire: a TPE sleeve that has been used for a long time, has become discolored, or has become sticky should be replaced, and the fact that a replacement can be purchased is a real advantage compared with products where the sleeve is fixed in place.
However, factor in the cost in the total calculation. A Men One for 299 SEK plus two extra sleeves for 207.95 SEK each comes to 714.90 SEK — almost exactly what the manufacturer itself charges for just the product, 727.95 SEK. If you know for yourself that you’ll want to change the structure, you should factor that in before choosing a model.
The manufacturer highlights the practical lid as a separate point, and the reason is hygienic rather than aesthetic: with the lid on, the product can be closed and stored without the channel being exposed to dust. On a TPE surface, that’s more relevant than it sounds, because the material is slightly sticky and attracts particles.
Satisfyer also emphasizes that the completely manual use and the lid make the product suitable for taking on trips. That’s true to a point — there’s no battery to declare and no charger to forget — but at 550 grams, it’s still 255 grams more luggage than a Men Vibration at 295 grams, and a product a quarter of a meter long takes up space in a bag. The wording "perfect as a gift" in the manufacturer’s own text says more about the design than about the format.
Satisfyer publishes no decibel value for Men One, and there is also nothing to publish. The product contains no motor, no eccentric weight, and no electrically driven pump. The sounds that occur come from air that is moved when you pump and from movement in the sleeve during use—so noise levels are determined by how the product is used, not by a component that can be measured.
That makes Men One quieter than practically every motorized model in the category, and it’s one of the few areas where the lack of electronics is a pure advantage with no downside. If you want the quietest possible product for a home with thin walls, an entirely manual design is hard to beat. It should be noted that sites that state a decibel value for Men One give a value that has no equivalent from the manufacturer.
Satisfyer states the enclosure rating IPX7 for Men One. The rating comes from the international standard IEC 60529, and the number 7 in the second position means that the product has been tested for submersion in water to a depth of one meter for 30 minutes. In practice, that means the entire product can be rinsed off without any caution—and unlike on a battery-driven model, there is nothing here that can be damaged if you forget it in the sink.
The difference compared to a splash-proof product is bigger than the wording suggests. Splash protection covers drops and, at best, sprays, but not submersion. Such a product can handle a damp cloth and possibly a shower, but not being left lying in a sink with water. With IPX7, both the outer casing and the sleeve can be handled without that compromise, which is particularly valuable for a masturbator because cleaning requires that you actually get water into the channel.
If a product has no IPX rating at all, it should be treated as not waterproof. The absence of a rating is never a sign that the product is approved—it’s only a sign that the manufacturer hasn’t tested it, or doesn’t want to report the results.
The manufacturer’s instructions for Men One are brief: clean with a little soap and lukewarm water, and disinfect with toycleaner. For the sleeve, Satisfyer states that warm water is enough to clean the surface. The practical add-on that matters most is drying—a TPE channel that’s put away while damp is by far the most common reason a masturbator starts to smell. Remove the sleeve, rinse it from both sides, let it air-dry completely, and put it back only once it’s dry.
Satisfyer also sells a separate maintenance product for this type of material, Men Renewing Powder, as well as a disinfectant spray. Dusting is standard procedure for TPE and helps prevent the surface from becoming sticky once it has dried. The person who doesn’t want to buy the manufacturer’s own product uses regular corn starch—but since Satisfyer markets the powder as an accessory specifically for this series, it’s a reasonable sign that the material needs it.
Lubricant is mandatory rather than optional for a product of this type, and the manufacturer recommends its own water-based lubricants, including the warming and cooling variants. Do not use silicone-based lubricant: the casing’s grip is silicone, and silicone-based products break down silicone surfaces over time. Oil-based products like coconut oil should be avoided on both TPE and silicone, because they leave a film that is difficult to rinse out of a tight channel.
This section is short for a reason: Satisfyer Men One has no battery, no charging port, and no electrical components at all. The manufacturer expressly states that the product works completely without batteries or accumulators, and consequently the feature table lacks the rows for battery type, operating time, and charging time that are found on the brand’s motorized models.
It isn’t. The question is often asked, partly because the product name is close to Satisfyer’s rechargeable models, and partly because store texts sometimes reuse wording between articles. There’s no USB port, no magnetic connector, and no cable included. If you want a rechargeable Satisfyer in the Men series, it’s Men Vibration or Men Heat Vibration you should look at—not this one.
Practically speaking, this means the product is ready as soon as you take it out, regardless of how long it has been in the box. This is also the only reason why a 15-year warranty is a realistic promise: the warranty period on a battery-powered product is in practice always limited by the cell, and Satisfyer’s own warranty terms also expressly exclude batteries included with the product. On Men One, there’s no battery to exclude.
On a product without electronics, the whole lifespan question is moved to the material. The ABS and silicone casing has no natural aging mechanism during normal use; what wears out is the sleeve. TPE softens, becomes sticky, and can discolor over time, especially if it is stored damp, in sunlight, or in contact with other soft plastic material. The manufacturer’s instructions expressly state that the product should not be used if it is deformed or discolored.
That is why the availability of replacement sleeves for 207.95 SEK is such a central part of the evaluation of this product. A housing that lasts for fifteen years is only worth something if there is a sleeve to put into it, and Satisfyer currently has six of them in its range. How long they will remain available is the only real uncertainty in that calculation—and no source can answer it.
We do not have price data from shops in your market yet.
The feature table says ABS plastic and silicone. The user manual says silicone, ABS, TPU, and TPE. It is the latter list that describes the surface against the skin.
Three comparisons are relevant: against the larger manual model in the same series, against the motorized model, which paradoxically is cheaper in Swedish stores, and against disregarding the housing and just buying a sleeve. All the specifications below come from the manufacturer’s own product pages, and all Swedish prices come from the stores’ product feeds on July 29, 2026.
Satisfyer Men Classic costs from 249 SEK at Swedish stores, which is 50 SEK less than Men One. It is based on the same principle: an internal pressure regulator, a replaceable cover in cyberskin, a hygienic seal, IPX7, and a 15-year warranty. In the manufacturer’s own web shop, however, the relationship is the reverse—Classic costs 519.95 SEK, while Men One costs 727.95 SEK.
The differences that can be documented are dimensional and material. Classic is 258.7 millimeters long versus Men One’s 250 millimeters, 96 millimeters wide versus 72 millimeters, and weighs 699 grams versus 550 grams. So it is noticeably bulkier. The material specification also differs: the manufacturer lists ABS plastic and TPE for Classic, while Men One is listed as ABS plastic and silicone in the corresponding table. So the silicone-coated grip is only on Men One, and that is the most noticeable difference in your hand.
Conclusion: if you want the largest possible sleeve and the lowest possible price, Classic is the way to get there. If you want an additional format and a grip that isn’t hard plastic, the extra 50 crowns for Men One is reasonably well spent. Functionally, you get the same thing.
This is the comparison that should affect the most purchase decisions. Satisfyer Men Vibration costs from 286 SEK at Swedish stores—so it is 13 SEK less than Men One at its cheapest. For that amount, you get a product with a rechargeable battery and vibration, which weighs 295 grams instead of 550 and which the manufacturer specifies as ABS plastic and silicone. In Satisfyer’s own web shop, it costs 779.95 SEK versus Men One’s 727.95, so the price relationship in Swedish stores is not what the manufacturer has in mind.
What Men One has that Men Vibration doesn’t is the manual pressure regulator, the replaceable sleeve system with six structures, and the lack of a battery that one day runs out. What Men Vibration has is a motor. Which one weighs more is a matter of taste, but it’s worth knowing that the manufacturer’s own customer rating points slightly toward Men Vibration: 3.7 out of 5 based on 90 reviews versus Men One’s 3.4 out of 5 based on 196 reviews.
Practical advice: if you don’t specifically want an entirely manual product, you should at least look at Men Vibration before you order, since the price argument for Men One completely disappears in this comparison.
The third comparison is against nothing at all. One of Satisfyer’s own replacement sleeves costs 207.95 SEK and is, in practice, a standalone masturbator without a casing: Tornado Bliss measures 217.3 × 66 × 78.6 millimeters and weighs 302 grams. The difference versus a complete Men One for 299 SEK is 91 SEK, and what you pay them for is the casing, the lid, and the pump.
Is the pump function worth 91 SEK? It depends on how much value you place on being able to vary the tightness and on being able to close the product for storage. A casing that you keep for many years and put new sleeves into is a reasonable basic investment. A sleeve without a casing is cheaper but lacks both adjustment and protection, and it’s harder to keep clean during storage. What speaks in favor of the casing is that the cost is only paid once.
Eight Swedish stores sell the item with EAN 4049369015887. Cheapest are Blush Me and SexleksakerOutlet at 299 SEK each, and most expensive is Sexonic at 599 SEK. That’s 300 SEK, or a 100 percent difference, for the exact same item number and the same packaging—one of the largest relative spreads in the entire category.
The stock situation slightly softens the picture. Sex av de åtta butikerna hade produkten i lager vid priskontrollen, and the most expensive of them—Sexonic at 599 SEK—wasn’t one of them. Among the stores that actually had the item at home, the range went from 299 SEK at Blush Me and SexleksakerOutlet to 449 SEK at Taboo, i.e. a 150 SEK difference. Stores that list a product as sold out may have an old price left in the feed, and that price is rarely what you end up paying when the item comes in again.
A point of reference that’s easy to miss: Satisfyer sells Men One itself for 727.95 SEK in its Swedish web shop. All eight resellers are therefore below the manufacturer’s own price, and the cheapest is at 41 percent of it. That makes the list price largely unusable as a measure of what the product is worth, and it explains why several stores list a regular price of 599 SEK that they rarely actually charge.
The prices in the table above are updated when the shops’ product feeds are updated, but always check the final price at checkout. At this price level, most shops are below the threshold for free shipping, which means that the shipping cost can eat up the entire difference between the cheapest and the second-cheapest shop. Calculate the total, not the product price.
An unusual feature in this desk review is that the manufacturer itself publishes a customer rating, and that it isn’t particularly flattering. Satisfyer’s Swedish product page states 3.4 out of 5 stars based on 196 reviews, with the breakdown 74 fives, 30 fours, 27 threes, 19 twos, and 46 ones. It’s a polarized distribution rather than an even one: almost a quarter of the reviews are the lowest rating.
That distribution is informative in itself. A product that gets both many fives and many ones is typically one where expectations differ more than quality does, and that matches what Men One actually is: a fully manual product that’s marketed alongside motorized models in the same series and at a similar price. For comparison, the manufacturer lists 3.7 out of 5 based on 90 reviews for Men Vibration.
A caveat applies here. The rating comes from the manufacturer’s own shop, so it isn’t an independent measurement, and Satisfyer states that reviews are published after they’ve been reviewed. That makes the figure more interesting as a baseline than as a definitive answer—a manufacturer that moderates its own reviews and still ends up at 3.4 has probably not removed very much.
It’s for you if you specifically want a manual product without electronics, and who sees that as an advantage rather than a drawback. It’s for you who wants to be able to change the canal’s texture without buying a new product, because the manufacturer sells six sleeves for the same shell. It’s for you who wants the quietest option imaginable, for you who want to be able to rinse the entire product off without thinking about electronics, and for you who want a silicone-coated grip instead of hard plastic.
It’s not for you if you want vibration—Satisfyer Men Vibration costs less in Swedish shops and has a motor. It’s not for you if you want an all-silicone product, because the contact surface is TPE, not silicone. It’s not for you if you require a published phthalate-free declaration, because Satisfyer doesn’t publish any for this model. And it’s not for you if you need to know the channel’s inner measurements in advance, because the manufacturer doesn’t publish them.
One more thing belongs in the decision. But Men One is a product whose total cost doesn’t end at the purchase. The sleeve is a consumable part; replacement sleeves cost 207,95 SEK per piece, and the manufacturer also sells a special powder and disinfection product for the same material. If you only calculate based on 299 SEK, you’re calculating the outer shell — and it’s the outer shell, not the sleeve, that lasts for fifteen years.
Satisfyer offers a 15-year warranty on Men One, and that’s one of the longest commitments in the entire category. The terms specify how it should be counted: the warranty applies for 15 years from the point when the legally required warranty period in the buyer’s country has expired, and it covers material and manufacturing defects that affect the product’s function. The receipt must be kept for the entire warranty period.
The exceptions are worth reading before you factor in the warranty. It does not cover included batteries, not consumables such as condoms, lubricants, massage oils, and cleaning products, not external changes resulting from normal wear and tear, and not damage caused by accidents, misuse, or carelessness. It also doesn’t apply to products that the customer has opened or taken apart. The last point is the most relevant here: Satisfyer does not specify whether removing the sleeve for cleaning — which the product is designed for — counts as taking the product apart, and you’ll need to find out with the store or the manufacturer if that ever becomes relevant.
Practically speaking, the exception for normal wear and tear also means that the part that actually breaks first, the TPE sleeve, is outside the warranty. A fifteen-year warranty on an ABS outer shell without moving parts is a generous but cheap commitment; what you don’t get is a warranty for what wears out.
What always applies is your statutory rights. Under the Consumer Sales Act (konsumentköplagen), you have a three-year right to lodge a complaint (reklamation) for defects in the item, regardless of what the manufacturer promises. In addition, for distance purchases you also have a right of withdrawal for fourteen days under the Act on Distance Contracts and Contracts Outside Business Premises (distansavtalslagen). Be aware that, in practice, the right of withdrawal is limited for hygiene products that have been taken out of a sealed package — but the right to complain about defects always applies. If you have questions about what applies in your case, Konsumentverket guides you via Hallå konsument.
Satisfyer Men One is ranked på plats 9 av 20 in masturbator best i test, where the entire category is compared against each other using five shared criteria. Guiden vinns av Satisfyer Men Vibration+.
Every numerical piece of information in the text can be traced to one of the sources below. The links were checked manually on the specified date.
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