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Enigmas and puzzles

By Ian Stewart   December 2007

“Is that chocolate? It has a funny shape,” said Twindledum.

“It’s a new kind of chocolate bar,” replied Twindledee. “It’s called a T-bar because it’s shaped a bit like a letter T. [See a] And you don’t just eat it—you play a game with it.”

“Mum always said not to play with our food.”

“Yes, and we never took any notice,” said Twindledee. “Each square of chocolate has a different flavour. And one of them, at the junction of the upright and the arms of the T, is really nasty. The rules are that we take turns breaking off…

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