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BP266 At least one touch or cross point vs. no touch or cross point.
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CROSSREFS

Adjacent-numbered pages:
BP261 BP262 BP263 BP264 BP265  *  BP267 BP268 BP269 BP270 BP271

CONCEPT x-crossing (info | search),
or (info | search),
existence (info | search),
t-point (info | search)

WORLD

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AUTHOR

Merse E. Gáspár

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