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0. Consider the following grammar S --> Ax / By A --> By/Cw B --> x / Bw C--> y Which of the regular expressions describe the same set of strings as the grammar ?
xw * y + xw * yx + ywx
xwy + xw * xy + ywx
xw * y + xw x yx + ywx
xw xy + xww * y + ywx
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