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* https://en.wikipedia.org/wiki/Finite-state_machine
+* https://en.wikipedia.org/wiki/State_diagram
+* http://www.edn.com/design/systems-design/4416049/State-machines-ease-programming-microcontrollers
* https://en.wikipedia.org/wiki/Nondeterministic_finite_automaton
* https://en.wikipedia.org/wiki/Deterministic_finite_automaton#Complete_and_incomplete
* http://43oh.com/2017/02/how-to-implement-finite-state-machines-using-energia/
+* http://aigamedev.com/open/article/hierarchical-or-nested-fsm/
+