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In this lecture, the focus is on deriving a regular expression from a given NFA. The procedure involves writing equations for each state in the NFA, which consists of three states: q1 (the starting state), q2, and q3 (the final state). The first step is to analyze the transitions leading into the final state, q3, to construct its equation. By examining the incoming transitions for each state, the equations for all states will eventually be combined with the final state's equation to formulate the required regular expression for the NFA. The method will become clearer as the lecture progresses through solving the example.