3.34 Design a logic circuit that has five input variables and one output variable. Four of the input variables represent BCD digits, and the fifth is a control line. While the control line is at logic 0, the output should be logic 1 only if the BCD digit is greater than or equal to 5. While the control line is high, the output should be logic 1 only if the BCD digit is less than or equal to 5.