1. Let M = ({qo, q1, q2, q3, q4, q5}, {a, b, c, d}, qo, fs, {q4, q5}) be the Deterministic Finite Automaton (DFA) with state transition function, f: defined as follows: f(qo, a) = q1 f(qo, b) = q3 f(qo, c) = q2 f(90, d) = q3 f(q1, a) = q1 f(q1, b) = q4 f(q1, c) = q1 f(q1, d) = q1 f(q2, a) = q2 f(q2, b) = q2 f(q2, c) = q2 f(q2, d) = qs f(q3, a) = q3 f(q3, b) = q3 f(q3, c) = q3 f(q3, d) = q3 f(q4, a) = q1 f(q4, b) = q4 f(q4, c) = q1 f(q4, d) = q1 f (qs, a) = q2 f(qs, b) = q2 f(qs, c) = q2 f(q5, d) = qs

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