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Segments approximately parallel to each other vs. large angles between segments.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 226.`
	CROSSREFS	`Adjacent-numbered pages: BP34 BP35 BP36 BP37 BP38 * BP40 BP41 BP42 BP43 BP44`
	KEYWORD	`finished, unorderedtriplet, traditional, bongard`
	CONCEPT	`all (info \| search),` `line_slope (info \| search),` `same (info \| search),` `similar (info \| search),` `three (info \| search),` `parallel (info \| search)`
	WORLD	`three_segments [smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

Extensions of segments cross at one point vs. extensions of segments do not cross at one point.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 239.`
	CROSSREFS	`Adjacent-numbered pages: BP73 BP74 BP75 BP76 BP77 * BP79 BP80 BP81 BP82 BP83`
	KEYWORD	`finished, unorderedtriplet, traditional, bongard`
	CONCEPT	`all (info \| search),` `lines_coincide (info \| search),` `imagined_point (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search)`
	WORLD	`three_segments [smaller \| same \| bigger]`
	AUTHOR	`Mikhail M. Bongard`

Equal number of horizontal and vertical lines vs. unequal number of horizontal and vertical lines.

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	CROSSREFS	`Adjacent-numbered pages: BP276 BP277 BP278 BP279 BP280 * BP282 BP283 BP284 BP285 BP286`
	KEYWORD	`traditional`
	CONCEPT	`horizontal (info \| search),` `number (info \| search),` `same_number (info \| search),` `same (info \| search),` `vertical (info \| search)`
	WORLD	`segments_cross [smaller \| same \| bigger]`
	AUTHOR	`Sang-Joon Yoon`

Lines if slightly extended make up a regular polygon vs. lines if slightly extended cannot make up a regular polygon.

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	CROSSREFS	`Adjacent-numbered pages: BP294 BP295 BP296 BP297 BP298 * BP300 BP301 BP302 BP303 BP304`
	KEYWORD	`traditional`
	CONCEPT	`imperfection_small (info \| search)`
	WORLD	`segments [smaller \| same \| bigger]`
	AUTHOR	`"Lewis"`

Equal horizontal length vs. not

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	COMMENTS	`All examples in this Problem are pairs of straight line segments.` `This problem communicates the idea of projected distance, in this case from 2D to 1D (x-axis).`
	CROSSREFS	`Adjacent-numbered pages: BP552 BP553 BP554 BP555 BP556 * BP558 BP559 BP560 BP561 BP562`
	KEYWORD	`nice, precise, allsorted, stretch, perfect, unorderedpair, preciseworld`
	CONCEPT	`projection (info \| search)`
	WORLD	`two_segments [smaller \| same \| bigger]`
	AUTHOR	`Leo Crabbe`

Four regions vs. less than four regions enclosed by straight lines

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	COMMENTS	`All examples in this Problem are a number of (possibly overlapping) straight lines.`
	CROSSREFS	`Adjacent-numbered pages: BP771 BP772 BP773 BP774 BP775 * BP777 BP778 BP779 BP780 BP781`
	WORLD	`segments_cross [smaller \| same \| bigger]`
	AUTHOR	`Finn Collins`

Nothing vs. nothing.

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	CROSSREFS	`Adjacent-numbered pages: BP849 BP850 BP851 BP852 BP853 * BP855 BP856 BP857 BP858 BP859`
	KEYWORD	`left-finite, right-finite, left-full, right-full, finished, experimental, funny`
	WORLD	`nothing [same \| bigger] zoom in left (nothing) \| zoom in right (nothing)`
	AUTHOR	`Aaron David Fairbanks`

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