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A crab canon is an arrangement of two things that are complementary and backward, similar to a palindrome. Originally it is a musical term for a kind of canon in which one line is reversed in time from the other (e.g. FABACEAE <=> EAECABAF). It can also refer to people's names such as Martin Russ and Russ Martin. The use of the term in non-musical contexts was popularized by Douglas Hofstadter in Gödel, Escher, Bach.
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