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Mysterious Benedict Society and The Prisoner's Dilemma

“The answer to this riddle has a hole in the middle, And some have been known to fall in it. In tennis it's nothing, but it can be received, And sometimes a person may win it. Though not seen or heard it may be perceived, Like princes or bees, it's in clover. The answer to this riddle has a hole in the middle, And without it, one cannot start over.”

This is a riddle that comes from Trenton Lee's book, The Mysterious Benedict Society and the Prisoner's Dilemma