design a pulse-mode (Asynchronous, no clock) automatic vending machine. The candy bars inside the machine cost 25 cents. The machine accepts nickels, dimes and quarters. There is an electromechanical system that accepts the coins sequentially. The circuit produces a level output (Z=1) that delivers the candy whenever the amount received by the machine is 25 cents or more (the machine does not give you change, so for example if you insert a dime followed by a quarter, you get the candy but no dime in return). After a candy selection is made, a "reset pulse" automatically turns off the choice indicator and resets the sequential circuit. Design your circuit using SRFF.