grid = twenty_zeros()
grid.zeros[0][3] = 1
grid.zeros[1][2] = 1; grid.zeros[1][4] = 1
grid.zeros[2][1] = 1; grid.zeros[2][5] = 1
(grid.zeros[3][x] = 1 for x in range(7))

turns out it's 28, not twenty.

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