for a in range(0, 4): for b in range(0, 3): print("a", a, "b", b)
Standard input is empty
a 0 b 0 a 0 b 1 a 0 b 2 a 1 b 0 a 1 b 1 a 1 b 2 a 2 b 0 a 2 b 1 a 2 b 2 a 3 b 0 a 3 b 1 a 3 b 2
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