The On-Line Encyclopedia of Bongard Problems

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Constructible Polygon vs. Non-constructible Polygon

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	REFERENCE	`https://en.wikipedia.org/wiki/Straightedge_and_compass_construction` `https://en.wikipedia.org/wiki/Constructible_polygon`
	CROSSREFS	`Adjacent-numbered pages: BP1132 BP1133 BP1134 BP1135 BP1136 * BP1138 BP1139 BP1140 BP1141 BP1142`
	KEYWORD	`stub, precise, math, hardsort, proofsrequired, preciseworld`
	AUTHOR	`Jago Collins`

BP1145

Polygon that can be achieved by folding a square once vs. other polygons.

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	COMMENTS	`Although it is tempting at first to make a version of this Bongard Problem with the solution "Shape can be achieved by folding a square a finite amount of times vs. other shapes", this alternate Bongard Problem would just amount to having the solution "Convex shape with straight edges vs. concave shape or convex shape with at least one curved edge."`
	CROSSREFS	`Adjacent-numbered pages: BP1140 BP1141 BP1142 BP1143 BP1144 * BP1146 BP1147 BP1148 BP1149 BP1150`
	KEYWORD	`precise, notso, stretch, left-narrow, finishedexamples, preciseworld`
	CONCEPT	`square (info \| search)`
	AUTHOR	`Leo Crabbe`

BP1147

Columns of the table could be respectively labeled "Number" and "Number of times number appears in this table" vs. not so.

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	CROSSREFS	`Adjacent-numbered pages: BP1142 BP1143 BP1144 BP1145 BP1146 * BP1148 BP1149 BP1150 BP1151 BP1152`
	KEYWORD	`nice, precise, notso, handed, leftright, left-narrow, grid, preciseworld`
	CONCEPT	`self-reference (info \| search)`
	AUTHOR	`Leo Crabbe`

BP1148

Number of dots in the Nth box (from the left) is how many times the number (N - 1) appears in the whole diagram vs. not so.

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	COMMENTS	`Left-sorted examples are sometimes called self-descriptive sequences.`
	CROSSREFS	`See BP1147 for a similar idea.` `BP1149 was inspired by this.` `Adjacent-numbered pages: BP1143 BP1144 BP1145 BP1146 BP1147 * BP1149 BP1150 BP1151 BP1152 BP1153`
	KEYWORD	`nice, precise, unwordable, notso, handed, leftright, left-narrow, sequence, preciseworld, left-listable, right-listable`
	CONCEPT	`self-reference (info \| search)`
	AUTHOR	`Leo Crabbe`

BP1149

Number in the Nth box (from the left) is how many numbers appear N times vs. not so.

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	CROSSREFS	`Inspired by BP1148.` `Adjacent-numbered pages: BP1144 BP1145 BP1146 BP1147 BP1148 * BP1150 BP1151 BP1152 BP1153 BP1154`
	KEYWORD	`nice, precise, unwordable, notso, handed, leftright, left-narrow, sequence, preciseworld, left-listable, right-listable`
	CONCEPT	`self-reference (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP1156

Centred vs. not.

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	CROSSREFS	`Adjacent-numbered pages: BP1151 BP1152 BP1153 BP1154 BP1155 * BP1157 BP1158 BP1159 BP1160 BP1161`
	KEYWORD	`precise, minimal, boundingbox, left-finite, left-full, perfect, pixelperfect, finishedexamples, preciseworld, absoluteposition`
	CONCEPT	`center (info \| search)`
	AUTHOR	`Leo Crabbe`

BP1168

Image contains the exact arrangement of pixels that form the "S" creature depicted in EX9532 in exactly one place vs. arrangement is present in multiple places.

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	CROSSREFS	`Adjacent-numbered pages: BP1163 BP1164 BP1165 BP1166 BP1167 * BP1169 BP1170 BP1171 BP1172 BP1173`
	EXAMPLE	`This Problem was made to serve as an example of something BP1166 would sort on its left.`
	KEYWORD	`precise, arbitrary, example, pixelperfect, help, preciseworld`
	AUTHOR	`Leo Crabbe`

BP1183

One resolution vs. another.

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	CROSSREFS	`Adjacent-numbered pages: BP1178 BP1179 BP1180 BP1181 BP1182 * BP1184 BP1185 BP1186 BP1187 BP1188`
	KEYWORD	`precise, arbitrary, pixelperfect, contributepairs, right-couldbe, preciseworld`
	AUTHOR	`Leo Crabbe`

BP1197

No sequence is repeated twice in a row vs. some sequence is repeated twice in a row.

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	REFERENCE	`https://en.wikipedia.org/wiki/Square-free_word`
	CROSSREFS	`Adjacent-numbered pages: BP1192 BP1193 BP1194 BP1195 BP1196 * BP1198 BP1199 BP1200 BP1201 BP1202`
	KEYWORD	`precise, allsorted, notso, left-narrow, traditional, preciseworld, dithering, left-listable`
	CONCEPT	`two (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

BP1223

Center square is black vs. center square is white.

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	COMMENTS	`All examples are a three by three grid of black or white squares.`
	CROSSREFS	`Adjacent-numbered pages: BP1218 BP1219 BP1220 BP1221 BP1222 * BP1224 BP1225 BP1226 BP1227 BP1228`
	KEYWORD	`stub, left-finite, right-finite, traditional, preciseworld`
	CONCEPT	`outlined_filled (info \| search),` `center (info \| search)`
	AUTHOR	`Aaron David Fairbanks`

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