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By using 5 NOR gates, we can implements half-subtractor.

The inputs for 1st NOR gate are A and B,

for 2nd NOR gate inputs are the output of 1st NOR gate and A input,

for 3rd NOR gate inputs are the output of 1st NOR gate and B input,

for 4th NOR gate the inputs are gates 2 and 3, and for last gate input is the output of the 4th gate.

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