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Omni-MATH / Let S={(x,y)|x=1,2,…,1993,y=1,2,3,4}. If T⊂S and there aren't any squares in T. Find the maximum possible value of |T|. The squares in T use points in S as vertices.

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problem

Let S={(x,y)|x=1,2,…,1993,y=1,2,3,4}S = \{(x,y) | x = 1, 2, \ldots, 1993, y = 1, 2, 3, 4\}. If T⊂ST \subset S and there aren't any squares in T.T. Find the maximum possible value of |T|.|T|. The squares in T use points in S as vertices.
Plain-text mathematical notation (without MathML)
Let S={(x,y)|x=1,2,…,1993,y=1,2,3,4}. If T⊂S and there aren't any squares in T. Find the maximum possible value of |T|. The squares in T use points in S as vertices.
Original LaTeX notation
Let $S = \{(x,y) | x = 1, 2, \ldots, 1993, y = 1, 2, 3, 4\}$. If $T \subset S$ and there aren't any squares in $T.$ Find the maximum possible value of $|T|.$ The squares in T use points in S as vertices.

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