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+//example 3.7//
+//4 input nand gate using and and not//
+clc
+//refreshes all variables//
+clear
+//clears the screen//
+disp('in the figure output of first gate is given to input of second gate with the other input C. output of second gate is input to the third gate and finally a not gate is applied to third output.')
+//result//
+\ No newline at end of file