This year's Chalkdust christmas cards are now available to buy at https://www.mscroggs.co.uk/cards.
They contain 10 puzzles, and the solutions to the puzzles reveal a Christmassy picture on the front of the card. All your mathematical friends would love to be sent one.
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(PS. Lots of the cost of buying these is postage, so if I'm likely to see you in person in the near future, I can sell you them for cheaper)
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