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Find the simplest regular expression for a language L = {w | 2na(w) + 3nb(w) is even}, where na(w) and nb(w) denote the number of

Find the simplest regular expression for a language L = {w | 2na(w) + 3nb(w) is even}, where na(w) and nb(w) denote the number of as in w and that of bs in w, respectively.

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