-apply (exc_rewl ??? (x + (z + -z)) (plus_assoc ????));
-apply (exc_rewl ??? (x + (-z + z)) (plus_comm ??z));
-apply (exc_rewl ??? (x+0) (opp_inverse ??));
-apply (exc_rewl ??? (0+x) (plus_comm ???));
-apply (exc_rewl ??? x (zero_neutral ??));
-apply (exc_rewr ??? (y + (z + -z)) (plus_assoc ????));
-apply (exc_rewr ??? (y + (-z + z)) (plus_comm ??z));
-apply (exc_rewr ??? (y+0) (opp_inverse ??));
-apply (exc_rewr ??? (0+y) (plus_comm ???));
-apply (exc_rewr ??? y (zero_neutral ??) L);
+apply (Ex≪ (x + (z + -z)) (plus_assoc ????));
+apply (Ex≪ (x + (-z + z)) (plus_comm ??z));
+apply (Ex≪ (x+0) (opp_inverse ??));
+apply (Ex≪ (0+x) (plus_comm ???));
+apply (Ex≪ x (zero_neutral ??));
+apply (Ex≫ (y + (z + -z)) (plus_assoc ????));
+apply (Ex≫ (y + (-z + z)) (plus_comm ??z));
+apply (Ex≫ (y+0) (opp_inverse ??));
+apply (Ex≫ (0+y) (plus_comm ???));
+apply (Ex≫ y (zero_neutral ??) L);