Discussion
Assertion (A): The subset construction can in the worst case produce exponentially many states.
Reason (R): Each state of the deterministic automaton corresponds to a subset of the states of the nondeterministic one.
Answer: A
Both are true and the reason gives the mechanism, and the blow-up is rarely seen with real token definitions. Only reachable subsets are built, and the structure of typical lexical patterns keeps that number close to the size of the original automaton.
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