Figure 2shows an example of a state machine where "State6" is a sub-state-machine. This means, that when the overall state machine is in State6, this state can be distinguished to be in the sub-states "State7" or "State8". Sub-state-machines can be nested, that is, "State7" could be another sub-state-machine.

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Figure 2– Example of a state machine having a sub-machine