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A scanner is built for a language where the identifiers start with a letter followed by any number of letters, digits, or underscores, such that

A scanner is built for a language where the identifiers start with a letter followed by any
number of letters, digits, or underscores, such that there are no consecutive underscores. Draw
a deterministic finite automaton (DFA) with fewest states that accepts all identifiers and nothing
else.

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