Zeroing memory or registers
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mov dword ptr [a], 0
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mov eax, 0
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xor eax, eax
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Exclusive OR
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1 and 1 = 0
T and T = F
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1 and 0 = 1
T and F = T
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0 and 1 = 1
F and T = T
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0 and 0 = 0
F and F = F