Question: A student walks into a classroom and sees on the blackboard a diagram of a TG with two states that accepts only the word .

A student walks into a classroom and sees on the blackboard a diagram of a TG with two states that accepts only the word Λ. The student reverses the direction of exactly one edge, leaving all other edges and all labels and all + 's and - 's the same. But now the new TG accepts the language a*. What was the original machine?

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