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Y Z Y' + Z' (YZ)'
0 0 (1 + 1) = 1 (0.0)' = (0)' = 1
0 1 (1 + 0) = 1 (0.1)' = (0)' = 1
1 0 (0 + 1) = 1 (1.0)' = (0)' = 1
1 1 (0 + 0) = 0 (1.1)' = (1)' = 0

The result is due to de Morgan's law, but you can confirm it for yourself using a truth table.

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