Construct a candy vending machine. Each piece of candy costs 25 cents. The machine accepts quarter, dimes and nickels only.

You should have a start and stop (candy), Each state should reflect how much money the machine has accepted. For instance, you put a dime and a nickel into the machine, the current state should be 15 cents with 10 cents to go. Each arrow is a transition. It should have labels that reflect the next coin that is placed into the machine. If we need 10 cents for candy, we can accept a dime or two nickels.

RULE: If you pay too much, you need not return change in the state diagram.