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+// example 5.1//
+clc
+//clears the screen//
+clear
+//clears all existing variables//
+disp("we can DUAL the given equation as : ");
+disp('X= AB''+BC''+CD''' );
+disp(' Therefore, SO X'' = (A+B'')(B+C'')(C+D'')' );
+disp('this says that output Y=X''=(A+B'')(B+C'')(C+D'')' );
+\ No newline at end of file