A crab canon is an arrangement of two things that are complementary and backward. Originally it is a musical term for a kind of canon in which one line is reversed in time and pitch from the other (e.g. FABACEAE <=> CGCEGFGB). The use of the term in non-musical contexts was popularized by Douglas Hofstadter.
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... and 4,197 families residing in the town. The population density is 1,058.4/km² (2,740.4/mi²). There are 5,574 housing units at an average density of ...