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+//EX3_4: Simplify A'B + A'B'C'D' + ABCD'
+
+//clears the screen
+clc
+
+//clears already existing variables
+clear
+
+disp('A''B + A''B''C''D'' + ABCD''')
+disp('= A''(B + B''C''D'') + ABCD''')
+disp('= A''(B + C''D'') + ABCD''')
+disp('= B(A'' + ACD'') + A''C''D''')
+disp('= B(A'' + CD'') + A''C''D''')
+disp('= A''B + BCD'' + A''C''D''')