Question: The lock makes a transition from its current state to a new state whenever one of the three buttons is pressed and released. It ignores

The lock makes a transition from its current state to a new state whenever one of the three buttons is pressed and
released. It ignores its inputs if more than one button is pressed. Pressing the reset-button returns the lock to the state
marked "R" in the diagram (edges showing the transitions to the reset state are not shown in the diagram to make it
easier to read). Pressing "0" or "1" will cause the lock to follow the appropriately labeled transition from its current
state. The lock opens if it reaches the state marked "U". It is locked in all other states.

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