Question: uild NFAs for the following two languages. a ) The set of strings over the alphabet { a , s , e } such that

uild NFAs for the following two languages.
a) The set of strings over the alphabet {a, s, e} such that the last symbol in the string
has appeared before.
b) The set of strings over the alphabet {a, s, e} such that the last symbol in the string
has not appeared before.
You can assume that neither of these two languages contain \epsi in them

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