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Arithmetic modulo 3:
+3 -4 -3 -2 -1 0 1 2 3 4 -4 1 2 0 1 2 0 1 2 0 -3 2 0 1 2 0 1 2 0 1 -2 0 1 2 0 1 2 0 1 2 -1 1 2 0 1 2 0 1 2 0 0 2 0 1 2 0 1 2 0 1 1 0 1 2 0 1 2 0 1 2 2 1 2 0 1 2 0 1 2 0 3 2 0 1 2 0 1 2 0 1 4 0 1 2 0 1 2 0 1 2
*3 -4 -3 -2 -1 0 1 2 3 4 -4 1 0 2 1 0 2 1 0 2 -3 0 0 0 0 0 0 0 0 0 -2 2 0 1 2 0 1 2 0 1 -1 1 0 2 1 0 2 1 0 2 0 0 0 0 0 0 0 0 0 0 1 2 0 1 2 0 1 2 0 1 2 1 0 2 1 0 2 1 0 2 3 0 0 0 0 0 0 0 0 0 4 2 0 1 2 0 1 2 0 1
Same pattern is repeated every 3 lines and every 3 columns.