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Suppose the solution of X = sX+t is X=s*t, where s and t are regular expressions with variables and variable X does not appear in

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Suppose the solution of X = sX+t is X=s*t, where s and t are regular expressions with variables and variable X does not appear in s and t. Given the following equations among the variables A, B, C, D, and E of regular expressions, please find the solution for A: A = aB + bD B = aB + 6C + E C = aB + 6C D=bD + aE + E=bD + aE

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