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Build NFAs for the following two languages. a) The set of strings over alphabet {a, b, c} such that the last symbol in the string

Build NFAs for the following two languages.

a) The set of strings over alphabet {a, b, c} such that the last symbol in the string has appeared before.

b) The set of strings over alphabet {a, b, c} such that the last symbol in the string has not appeared before.

You can assume that neither of these two languages contain in them.

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