A clock pulse of 10 seconds period is used to clock a 3bit binary counter that counts from 0 to 7. The outputs of the three bistables are used as inputs to a combinational circuit that controls the sequence of the traffic lights , green, amber, red, amber&red. Green light is ON for 30 seconds. Amber is ON for 10 sec. Red is ON for 30 sec. Amber & Red light is ON for 10 sec  and so on.   (ON = Logic 1) Design the circuit by using D Flip flop and 12H6 PAL. Thank you.

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