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Question 4: Let R and S , T be grammars that generate some regular language. For every item say if the equality is correct. Prove

Question 4: Let R and S , T be grammars that generate some regular language. For every item say if the equality is correct. Prove precisely your answer.

1. R S = S R

2. ( R S ) T = RT ST

3. R S = ( R S )

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