The On-Line Encyclopedia of Bongard Problems

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Five concavities vs. not five concavities.

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	CROSSREFS	`Adjacent-numbered pages: BP226 BP227 BP228 BP229 BP230 * BP232 BP233 BP234 BP235 BP236`
	KEYWORD	`less, noisy, arbitrary, traditional`
	CONCEPT	`indentation (info \| search),` `number (info \| search),` `five (info \| search)`
	AUTHOR	`Giuseppe Insana`

There exists a closed trail that hits each vertex exactly once vs. not so.

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	COMMENTS	`Left examples are called "Hamiltonian graphs."`
	CROSSREFS	`Adjacent-numbered pages: BP557 BP558 BP559 BP560 BP561 * BP563 BP564 BP565 BP566 BP567`
	KEYWORD	`math, traditional`
	CONCEPT	`graph (info \| search),` `distinguishing_crossing_curves (info \| search)`
	WORLD	`connected_graph [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

Lower bound is object vs. lower bound is nothing.

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	CROSSREFS	`Adjacent-numbered pages: BP838 BP839 BP840 BP841 BP842 * BP844 BP845 BP846 BP847 BP848`
	KEYWORD	`creativeexamples, structure, rules`
	CONCEPT	`empty (info \| search)`
	WORLD	`constant_change_seq_increase_right_lower_bound [smaller \| same \| bigger] zoom in left (constant_change_seq_increase_right_low_bound_obj)`
	AUTHOR	`Aaron David Fairbanks`

Square outline vs. anything else.

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	CROSSREFS	`Adjacent-numbered pages: BP1215 BP1216 BP1217 BP1218 BP1219 * BP1221 BP1222 BP1223 BP1224 BP1225`
	KEYWORD	`stub, notso, left-narrow, left-finite, left-full, right-null, stableworld`
	CONCEPT	`square (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

A tail grows from the obtuse end vs. a tail grows from the acute end.

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	REFERENCE	`M. M. Bongard, Pattern Recognition, Spartan Books, 1970, p. 238.`
	CROSSREFS	`Adjacent-numbered pages: BP69 BP70 BP71 BP72 BP73 * BP75 BP76 BP77 BP78 BP79`
	KEYWORD	`nice, finished, traditional, bongard`
	CONCEPT	`size_increase_decrease (info \| search),` `tracing_line_or_curve (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Mikhail M. Bongard`

The rope, if extended, reaches the other ball vs. the rope, if extended, does not reach the other ball.

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	CROSSREFS	`Adjacent-numbered pages: BP230 BP231 BP232 BP233 BP234 * BP236 BP237 BP238 BP239 BP240`
	KEYWORD	`anticomputer, traditional`
	CONCEPT	`length_line_or_curve (info \| search),` `reachable (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search)`
	AUTHOR	`Peter Shanahan`

No pattern (variety of shapes) vs. all shapes have something in common.

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	CROSSREFS	`See BP378 for a similar idea using just two objects per example.` `Adjacent-numbered pages: BP342 BP343 BP344 BP345 BP346 * BP348 BP349 BP350 BP351 BP352`
	KEYWORD	`nice, left-unknowable, right-narrow, traditional, collection`
	CONCEPT	`existence (info \| search),` `shape_cluster (info \| search),` `cluster_of_one (info \| search),` `cluster (info \| search)`
	WORLD	`several_small_misc [smaller \| same \| bigger]`
	AUTHOR	`Aaron David Fairbanks`

Impossible solid in 3-D vs. possible solid in 3-D.

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	CROSSREFS	`Adjacent-numbered pages: BP247 BP248 BP249 BP250 BP251 * BP253 BP254 BP255 BP256 BP257`
	KEYWORD	`anticomputer, traditional`
	CONCEPT	`impossible (info \| search),` `3d_impossible_solid (info \| search)`
	AUTHOR	`Andreas Gunnarsson`

Rays emanating from a central point vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP282 BP283 BP284 BP285 BP286 * BP288 BP289 BP290 BP291 BP292`
	KEYWORD	`traditional`
	CONCEPT	`lines_coincide (info \| search),` `imagined_point (info \| search),` `imagined_line_or_curve (info \| search),` `imagined_entity (info \| search),` `triangle_arrow (info \| search),` `triangle (info \| search)`
	AUTHOR	`"Lewis"`

Curve with two complex parts vs. curve with three complex parts.

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	CROSSREFS	`Adjacent-numbered pages: BP180 BP181 BP182 BP183 BP184 * BP186 BP187 BP188 BP189 BP190`
	KEYWORD	`traditional`
	CONCEPT	`number (info \| search),` `curve_texture (info \| search),` `texture (info \| search)`
	WORLD	`curve [smaller \| same \| bigger]`
	AUTHOR	`Harry E. Foundalis`

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