des (0, 10, 6)
(0, COIN, 1)
(1, ACCEPTED, 2)
(1, REJECT, 0)
(2, DISPENCE, 3)
(3, COIN, 4)
(3, REFILL, 0)
(4, ACCEPTED, 5)
(4, REFILL, 1)
(4, REJECT, 3)
(5, REFILL, 2)