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RXRXS S aTb bTa TXTX X | (empty string) Xab 1) TT 2) TT I know the first one is false since you cannot derived

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RXRXS S aTb bTa TXTX X | (empty string) Xab 1) TT 2) TT I know the first one is false since you cannot derived it to T but for the second one my friend said it is true while I thought it is false. I was wondering how do you eventually derived from T to T. Can someone show me the process for TT

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