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(A' nor B) nor B
= (A' or B)' nor B
= (A and B') nor B
= ((A and B') or B)'
= (A and B')' and B'
= (A' or B) and B'
= (A' and B') or (B and B')
= (A' and B') = (A or B)' Ãßõ:±Â½î