The On-Line Encyclopedia of Bongard Problems

Ends of the curve are parallel vs. ends of the curve are perpendicular.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 237.`
	CROSSREFS	`Adjacent-numbered pages: BP67 BP68 BP69 BP70 BP71 * BP73 BP74 BP75 BP76 BP77`
	KEYWORD	`nice, precise, unstable, ignoreimperfections, finished, traditional, bongard`
	CONCEPT	`slope_at_endpoint (info \| search),` `tracing_line_or_curve (info \| search),` `parallel (info \| search),` `perpendicular (info \| search)`
	WORLD	`curve [smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

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