YES After renaming modulo { b->0, c->1, a->2, d->3 }, it remains to prove termination of the 8-rule system { 0 1 2 -> 2 0 , 0 0 0 -> 1 2 1 , 1 3 -> 3 1 , 1 3 0 -> 3 1 1 , 3 1 -> 0 0 0 , 1 0 -> 3 2 , 3 0 1 -> 2 2 , 3 2 -> 0 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 2: 0 is interpreted by / \ | 1 1 | | 0 1 | \ / 1 is interpreted by / \ | 1 1 | | 0 1 | \ / 2 is interpreted by / \ | 1 0 | | 0 1 | \ / 3 is interpreted by / \ | 1 2 | | 0 1 | \ / After renaming modulo { 1->0, 3->1, 0->2, 2->3 }, it remains to prove termination of the 4-rule system { 0 1 -> 1 0 , 0 1 2 -> 1 0 0 , 1 0 -> 2 2 2 , 0 2 -> 1 3 } Applying the dependency pairs transformation. After renaming modulo { (0,true)->0, (1,false)->1, (1,true)->2, (0,false)->3, (2,false)->4, (3,false)->5 }, it remains to prove termination of the 10-rule system { 0 1 -> 2 3 , 0 1 -> 0 , 0 1 4 -> 2 3 3 , 0 1 4 -> 0 3 , 0 1 4 -> 0 , 0 4 -> 2 5 , 3 1 ->= 1 3 , 3 1 4 ->= 1 3 3 , 1 3 ->= 4 4 4 , 3 4 ->= 1 5 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 2: 0 is interpreted by / \ | 1 1 | | 0 1 | \ / 1 is interpreted by / \ | 1 0 | | 0 1 | \ / 2 is interpreted by / \ | 1 0 | | 0 1 | \ / 3 is interpreted by / \ | 1 0 | | 0 1 | \ / 4 is interpreted by / \ | 1 0 | | 0 1 | \ / 5 is interpreted by / \ | 1 0 | | 0 1 | \ / After renaming modulo { 0->0, 1->1, 4->2, 3->3, 5->4 }, it remains to prove termination of the 7-rule system { 0 1 -> 0 , 0 1 2 -> 0 3 , 0 1 2 -> 0 , 3 1 ->= 1 3 , 3 1 2 ->= 1 3 3 , 1 3 ->= 2 2 2 , 3 2 ->= 1 4 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 2: 0 is interpreted by / \ | 1 0 | | 0 1 | \ / 1 is interpreted by / \ | 1 2 | | 0 1 | \ / 2 is interpreted by / \ | 1 1 | | 0 1 | \ / 3 is interpreted by / \ | 1 1 | | 0 1 | \ / 4 is interpreted by / \ | 1 0 | | 0 1 | \ / After renaming modulo { 3->0, 1->1, 2->2, 4->3 }, it remains to prove termination of the 4-rule system { 0 1 ->= 1 0 , 0 1 2 ->= 1 0 0 , 1 0 ->= 2 2 2 , 0 2 ->= 1 3 } The system is trivially terminating.