![Matt Parker on Twitter: "Hey everybody, remember how much you like Klein bottles? Get in there and vote for them now! https://t.co/vIpolJgvcz https://t.co/1eQdaRDCXP" / Twitter Matt Parker on Twitter: "Hey everybody, remember how much you like Klein bottles? Get in there and vote for them now! https://t.co/vIpolJgvcz https://t.co/1eQdaRDCXP" / Twitter](https://pbs.twimg.com/media/DiIcnBFXUAAw9Ie.jpg:large)
Matt Parker on Twitter: "Hey everybody, remember how much you like Klein bottles? Get in there and vote for them now! https://t.co/vIpolJgvcz https://t.co/1eQdaRDCXP" / Twitter
![Free Knitting Pattern for Klein Bottle Hat | Hat knitting patterns, Knitting patterns free hats, Beanie knitting patterns free Free Knitting Pattern for Klein Bottle Hat | Hat knitting patterns, Knitting patterns free hats, Beanie knitting patterns free](https://i.pinimg.com/736x/22/b5/f7/22b5f73bf550ab5a62229b8aca3c3c12.jpg)
Free Knitting Pattern for Klein Bottle Hat | Hat knitting patterns, Knitting patterns free hats, Beanie knitting patterns free
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