The On-Line Encyclopedia of Bongard Problems

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Any permutation of positions that sends one string of symbols to another sends each string of symbols to some other versus not so.

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	COMMENTS	`Restriction of BP841 to permutations.`
	CROSSREFS	`Adjacent-numbered pages: BP837 BP838 BP839 BP840 BP841 * BP843 BP844 BP845 BP846 BP847`
	KEYWORD	`hard, contributepairs, traditional`
	CONCEPT	`permutation (info \| search)`
	WORLD	`zoom in left \| zoom in right`
	AUTHOR	`Aaron David Fairbanks`

BP904

Rows show all possible ways a certain number of dots can be divided between a certain number of bins vs. not so.

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	COMMENTS	`The rows in the panels on the right hand side show all the ways you can divide a certain number of dots between a certain number of bins, ignoring which bins they are placed in.`
	CROSSREFS	`Adjacent-numbered pages: BP899 BP900 BP901 BP902 BP903 * BP905 BP906 BP907 BP908 BP909`
	KEYWORD	`solved, left-null, grid, left-listable, right-listable`
	CONCEPT	`permutation (info \| search)`
	AUTHOR	`Molly C Klenzak`

BP922

One row is rearranged to make the other by swapping an odd number of object pairs vs. one row is rearranged to make the other by swapping an even number of object pairs.

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	COMMENTS	`The mathematical terms for these operations are even and odd permutations.`
	CROSSREFS	`Adjacent-numbered pages: BP917 BP918 BP919 BP920 BP921 * BP923 BP924 BP925 BP926 BP927`
	KEYWORD	`precise, allsorted, math, left-narrow, right-narrow, unorderedpair, preciseworld, left-listable`
	CONCEPT	`even_odd (info \| search),` `permutation (info \| search)`
	AUTHOR	`Leo Crabbe`

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