* 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/
* 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/