Tetromino
A tetromino, sometimes called tetramino or tetrimino, is a four-squared polyomino. The seven tetrominoes are i, o, t, s, z, j, and l.
i
Other names include straight, stick, and long.
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o
Other names include square and block.
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t
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s
Other names include inverse skew.
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z
Other names include skew.
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j
Other names include gamma or inverse l.
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l
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