The On-Line Encyclopedia of Bongard Problems

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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`

Ends of line point to the same direction vs. ends of line do not point to the same direction.

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	CROSSREFS	`Adjacent-numbered pages: BP100 BP101 BP102 BP103 BP104 * BP106 BP107 BP108 BP109 BP110`
	KEYWORD	`noisy, traditional`
	CONCEPT	`slope_at_endpoint (info \| search),` `tracing_line_or_curve (info \| search)`
	AUTHOR	`Douglas R. Hofstadter`

Curve ends in a roughly up or down direction vs. curve ends in a roughly left or right direction.

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	CROSSREFS	`Adjacent-numbered pages: BP201 BP202 BP203 BP204 BP205 * BP207 BP208 BP209 BP210 BP211`
	KEYWORD	`traditional`
	CONCEPT	`downward_upward (info \| search),` `slope_at_endpoint (info \| search),` `line_or_curve_endpoint (info \| search),` `horizontal (info \| search),` `leftward_rightward (info \| search),` `tangent_absolute_direction (info \| search),` `absolute_direction (info \| search),` `vertical (info \| search),` `direction (info \| search)`
	AUTHOR	`Giuseppe Insana`

At least one ending edge is straight vs. all ending edges are curved.

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	CROSSREFS	`Adjacent-numbered pages: BP258 BP259 BP260 BP261 BP262 * BP264 BP265 BP266 BP267 BP268`
	KEYWORD	`traditional`
	CONCEPT	`curved_straight (info \| search),` `slope_at_endpoint (info \| search)`
	AUTHOR	`Pablo Barenbaum`

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