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Y=AC+A(B+C')+A'BCD'+AB'DE+B'C+BD'+CD'
=AC+AC'+AB+A'BCD'+AB'DE+B'C+BD'+CD'
=A+AB+A'BCD'+AB'DE+B'C+BD'+CD'
=A+A'BCD'+B'C+BD'+CD'
=A+BCD'+CD'+B'C+BD'
=A+CD'+B'C+BD'
=A+B'C+BD'+CD'
=A+B'C+BD'