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BP1209 Empty square present vs. no square present.
(edit; present; nest [left/right]; search; history)
CROSSREFS

Nearly identical to BP1221, which is the same except non-empty squares are allowed.

See BP24 for "circle present vs. not".

Adjacent-numbered pages:
BP1204 BP1205 BP1206 BP1207 BP1208  *  BP1210 BP1211 BP1212 BP1213 BP1214

KEYWORD

stub, left-narrow, traditional

CONCEPT empty (info | search),
existence (info | search),
square (info | search)

AUTHOR

Aaron David Fairbanks

BP1210 Vertical, horizontal, and both diagonal axes of symmetry vs. not (more specifically, one or fewer axes of symmetry).
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP1205 BP1206 BP1207 BP1208 BP1209  *  BP1211 BP1212 BP1213 BP1214 BP1215

KEYWORD

stub, left-narrow, traditional, blackwhiteinvariant

CONCEPT symmetry_axis (info | search),
symmetry (info | search),
four (info | search)

AUTHOR

Aaron David Fairbanks

BP1211 Triangle vs. anything else.
(edit; present; nest [left/right]; search; history)
CROSSREFS

See BP6 for "triangle vs. quadrilateral".

Adjacent-numbered pages:
BP1206 BP1207 BP1208 BP1209 BP1210  *  BP1212 BP1213 BP1214 BP1215 BP1216

KEYWORD

stub, notso, left-narrow, traditional

CONCEPT triangle (info | search)

AUTHOR

Aaron David Fairbanks

BP1212 Shape tiles a square vs. not
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP1207 BP1208 BP1209 BP1210 BP1211  *  BP1213 BP1214 BP1215 BP1216 BP1217

KEYWORD

precise

WORLD

fill_shape [smaller | same | bigger]

AUTHOR

Jago Collins

BP1213 Axis of symmetry along the NW/SE diagonal vs. axis of symmetry along the NE/SW diagonal
(edit; present; nest [left/right]; search; history)
CROSSREFS

Adjacent-numbered pages:
BP1208 BP1209 BP1210 BP1211 BP1212  *  BP1214 BP1215 BP1216 BP1217 BP1218

KEYWORD

stub, dual, handed, leftright, updown, rotate, stretch, left-narrow, right-narrow, traditional, both

CONCEPT diagonal (info | search),
symmetry_axis (info | search),
symmetry (info | search)

AUTHOR

Aaron David Fairbanks

BP1214 Left shape is bigger than right shape vs. right shape is bigger than left shape.
(edit; present; nest [left/right]; search; history)
CROSSREFS

BP1217 has the same solution but rotated a quarter-turn counter-clockwise.

Adjacent-numbered pages:
BP1209 BP1210 BP1211 BP1212 BP1213  *  BP1215 BP1216 BP1217 BP1218 BP1219

KEYWORD

stub, dual, handed, leftright, traditional

CONCEPT size (info | search),
quantity_comparison (info | search)

AUTHOR

Aaron David Fairbanks

BP1215 Axis of symmetry along the NW/SE diagonal vs. not.
(edit; present; nest [left/right]; search; history)
CROSSREFS

BP1206 is the same solution but with the vertical axis instead of the NW/SE diagonal.

BP1207 is the same solution but with the horizontal axis instead of the NW/SE diagonal.

Adjacent-numbered pages:
BP1210 BP1211 BP1212 BP1213 BP1214  *  BP1216 BP1217 BP1218 BP1219 BP1220

KEYWORD

stub, notso, handed, leftright, updown, rotate, left-narrow, traditional

CONCEPT diagonal (info | search),
symmetry_axis (info | search),
symmetry (info | search)

AUTHOR

Aaron David Fairbanks

BP1216 Arrow pointing north-west vs. arrow pointing south-east.
(edit; present; nest [left/right]; search; history)
CROSSREFS

BP1218 is "arrow pointing north-west vs. arrow pointing elsewhere".

Adjacent-numbered pages:
BP1211 BP1212 BP1213 BP1214 BP1215  *  BP1217 BP1218 BP1219 BP1220 BP1221

KEYWORD

stub, precise, dual, handed, leftright, updown, rotate, left-narrow, right-narrow, traditional

CONCEPT diagonal (info | search)

AUTHOR

Aaron David Fairbanks

BP1217 Bottom shape is bigger than top shape vs. top shape is bigger than bottom shape.
(edit; present; nest [left/right]; search; history)
CROSSREFS

BP1214 has the same solution but rotated a quarter-turn clockwise.

Adjacent-numbered pages:
BP1212 BP1213 BP1214 BP1215 BP1216  *  BP1218 BP1219 BP1220 BP1221 BP1222

KEYWORD

stub, dual, handed, updown, traditional

CONCEPT size (info | search),
quantity_comparison (info | search)

AUTHOR

Aaron David Fairbanks

BP1218 Arrow pointing north-west vs. arrow pointing elsewhere.
(edit; present; nest [left/right]; search; history)
CROSSREFS

BP1216 is "arrow pointing north-west vs. arrow pointing south-east".

Adjacent-numbered pages:
BP1213 BP1214 BP1215 BP1216 BP1217  *  BP1219 BP1220 BP1221 BP1222 BP1223

KEYWORD

stub, precise, allsorted, notso, handed, leftright, updown, rotate, left-narrow, traditional

CONCEPT diagonal (info | search)

AUTHOR

Aaron David Fairbanks

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