YES After renaming modulo { b->0, c->1, a->2 }, it remains to prove termination of the 1-rule system { 0 1 0 1 2 2 -> 2 2 2 0 1 0 1 0 1 } Applying the dependency pairs transformation. After renaming modulo { (0,true)->0, (1,false)->1, (0,false)->2, (2,false)->3 }, it remains to prove termination of the 4-rule system { 0 1 2 1 3 3 -> 0 1 2 1 2 1 , 0 1 2 1 3 3 -> 0 1 2 1 , 0 1 2 1 3 3 -> 0 1 , 2 1 2 1 3 3 ->= 3 3 3 2 1 2 1 2 1 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 7: 0 is interpreted by / \ | 1 0 1 0 0 0 0 | | 0 1 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | \ / 1 is interpreted by / \ | 1 0 0 0 0 0 0 | | 0 1 0 0 0 0 0 | | 0 0 0 1 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 1 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | \ / 2 is interpreted by / \ | 1 0 0 0 0 0 0 | | 0 1 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 1 0 0 | | 0 0 0 0 0 0 0 | | 0 0 1 0 0 0 0 | | 0 0 2 0 0 0 0 | \ / 3 is interpreted by / \ | 1 0 0 0 0 0 0 | | 0 1 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 0 | | 0 0 0 0 0 0 1 | | 0 1 0 2 0 1 0 | \ / After renaming modulo { 2->0, 1->1, 3->2 }, it remains to prove termination of the 1-rule system { 0 1 0 1 2 2 ->= 2 2 2 0 1 0 1 0 1 } The system is trivially terminating.