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All interiors are convex vs. at least one concave interior.

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	CROSSREFS	`Adjacent-numbered pages: BP172 BP173 BP174 BP175 BP176 * BP178 BP179 BP180 BP181 BP182`
	KEYWORD	`traditional`
	CONCEPT	`all (info \| search),` `concave_convex_angle (info \| search)`
	AUTHOR	`Harry E. Foundalis`

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