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BP1090 Top piece can slide into bottom area in such that there is an unbroken black horizontal region vs. not so.
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COMMENTS

Successful moves in Tetris.

CROSSREFS

Adjacent-numbered pages:
BP1085 BP1086 BP1087 BP1088 BP1089  *  BP1091 BP1092 BP1093 BP1094 BP1095

KEYWORD

precise, teach, culture, pixelperfect

AUTHOR

Leo Crabbe

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