3860/CH2/EX2.23/Ex2_23.txt


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 A'BCD + A'BC'D + B'EF + CDE'G + A'DEF + A'B'EF

 = A'BD + B'EF + CDE'G + A'DEF

 But A'BD $ B'EF = A'DEF and this reduces to 

 = A'BD + B'EF + CDE'G