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Let S be the subset of the Cartesian product
{0,1,2,3,4,5,6} × {0,1,2,3,4,5,6}
that is represented by the black pixels in the plot below.
Click on the pixels in the plot to toggle pixels between black and white thus change the set S.
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The set represented by the black pixels in the plot is
S = { (0,0), (0,1), (0,2), (0,3), (0,4), (0,5), (0,6), (1,0), (1,1), (1,2), (1,3), (1,4), (1,5), (1,6), (2,0), (2,1), (2,2), (2,3), (2,4), (2,5), (2,6), (3,0), (3,1), (3,2), (3,3), (3,4), (3,5), (3,6), (4,0), (4,1), (4,2), (4,3), (4,4), (4,5), (4,6), (5,0), (5,1), (5,2), (5,3), (5,4), (5,5), (5,6), (6,0), (6,1), (6,2), (6,3), (6,4), (6,5), (6,6),} ⊆ {0,1,2,3,4,5,6}×{0,1,2,3,4,5,6}