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Sketch of a deterministic finite automaton (DFA) for the following regular language (type 3):$$ L ~=~ \{ a^n ~:~ n \equiv 0 ~\text{mod}~2 ~\text{or}~3, ~~ \text{not}~6 \} $$
This is an infinite language with, for example, the following words \(w\):$$ L ~=~ \{aa, aaa, aaaa, aaaaaa,~.... \} $$
This automaton accepts all words \(w\) whose length is divisible by two or by three, but not by six.