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+// example 5.2//
+clc
+//clears the screen//
+clear
+//clears all existing variables//
+disp("we can SIMPLIFY the given equation as : ");
+disp('LET X= (A.B+C.D) and Y = (A.B +C.D).[(A''+B'')+(C''+ D'')]' );
+disp(' Therefore, Y = X.X'' = 0' );
+disp('this says that output Y equals to 0' );
+\ No newline at end of file