?. and A. <>, |? 2 RE 1 |? rev (L <> M) ? rev (M) <> rev (L) After normalization, we obtain the subgoals, )|? 2 RE 1 |RE ind (Q)? 1 rev (M 1 ) ? rev

?. and A. <>, |? 2 RE 1 |? rev (L <> M) ? rev (M) <> rev (L) After normalization, we obtain the subgoals, )|? 2 RE 1 |RE ind (Q)? 1 rev (M 1 ) ? rev