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Enigmas and puzzles

By Ian Stewart   February 2008

“And now to the next item on the agenda,” said the minister for futile exorbitance. “The Museum of 21st Century History. You will find the plan on page 1,723 of the architect’s proposal.”

There was a rustling of pages and several loud thumps as committee members located the plan. [See figure A]

“The circles are the exhibition rooms,” the minister explained. “The lines are connecting corridors. There will be one room for each of the years from 2001 to 2008.”

“What about the year 2000?” asked the permanent secretary for pointless prevarication.

“Technically, that was the last year of…

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