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BP146 A shape contains a square if and only if it is a circle vs. a shape contains a square if and only if it is a triangle.
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CROSSREFS

Adjacent-numbered pages:
BP141 BP142 BP143 BP144 BP145  *  BP147 BP148 BP149 BP150 BP151

KEYWORD

traditional

CONCEPT iff (info | search),
inside (info | search),
triangle (info | search)

AUTHOR

Douglas R. Hofstadter

    page 1

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