Frequently the purpose of a state is
to perform a sequential activity. When the activity is completed, a transition
to another state fires. An arrow without an event name indicates an automatic
transition that fires when the activity
associated with sources state is completed there is no activity, the unlabelled
transition fires as soon as the state is entered.
If a state has no one more automatic, but none
of the guard conditions are satisfied, then the state remains active until one
of the conditions is satisfied on until an event causes another transition to
fire.
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