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Drinks vending machine can only be put into hair and a dollar per bottle of $ 2.5 requires the application of state machine design of the system, and to prepare Testbench. Input signal definition: clk: clock input ngreset: the the reset signal half_yuan: five cents one_yuan: a dollar of output signal definition: dispense: indicates that the machine sold a bottle of beverage collect: for prompt the coin by take drinks half_out away: Retrieve Fifty Cent money