YES After renaming modulo { d->0, a->1, b->2, c->3 }, it remains to prove termination of the 4-rule system { 0 1 -> 2 0 , 2 -> 1 1 1 , 3 0 3 -> 1 0 , 2 0 0 -> 3 3 0 0 3 } The system was reversed. After renaming modulo { 1->0, 0->1, 2->2, 3->3 }, it remains to prove termination of the 4-rule system { 0 1 -> 1 2 , 2 -> 0 0 0 , 3 1 3 -> 1 0 , 1 1 2 -> 3 1 1 3 3 } Applying the dependency pairs transformation. After renaming modulo { (0,true)->0, (1,false)->1, (1,true)->2, (2,false)->3, (2,true)->4, (0,false)->5, (3,true)->6, (3,false)->7 }, it remains to prove termination of the 16-rule system { 0 1 -> 2 3 , 0 1 -> 4 , 4 -> 0 5 5 , 4 -> 0 5 , 4 -> 0 , 6 1 7 -> 2 5 , 6 1 7 -> 0 , 2 1 3 -> 6 1 1 7 7 , 2 1 3 -> 2 1 7 7 , 2 1 3 -> 2 7 7 , 2 1 3 -> 6 7 , 2 1 3 -> 6 , 5 1 ->= 1 3 , 3 ->= 5 5 5 , 7 1 7 ->= 1 5 , 1 1 3 ->= 7 1 1 7 7 } 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 2 | | 0 1 | \ / 2 is interpreted by / \ | 1 2 | | 0 1 | \ / 3 is interpreted by / \ | 1 0 | | 0 1 | \ / 4 is interpreted by / \ | 1 2 | | 0 1 | \ / 5 is interpreted by / \ | 1 0 | | 0 1 | \ / 6 is interpreted by / \ | 1 0 | | 0 1 | \ / 7 is interpreted by / \ | 1 0 | | 0 1 | \ / After renaming modulo { 6->0, 1->1, 7->2, 2->3, 5->4, 3->5 }, it remains to prove termination of the 7-rule system { 0 1 2 -> 3 4 , 3 1 5 -> 0 1 1 2 2 , 3 1 5 -> 3 1 2 2 , 4 1 ->= 1 5 , 5 ->= 4 4 4 , 2 1 2 ->= 1 4 , 1 1 5 ->= 2 1 1 2 2 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 6: 0 is interpreted by / \ | 1 0 1 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 | \ / 1 is interpreted by / \ | 1 0 0 0 0 0 | | 0 1 0 0 0 0 | | 0 0 0 1 0 0 | | 0 0 0 0 1 0 | | 0 0 0 0 0 1 | | 0 0 0 0 0 0 | \ / 2 is interpreted by / \ | 1 0 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 0 0 0 0 0 | | 0 0 0 0 0 0 | \ / 3 is interpreted by / \ | 1 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 | \ / 4 is interpreted by / \ | 1 0 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 0 0 0 0 0 | \ / 5 is interpreted by / \ | 1 0 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | | 0 1 0 0 0 0 | \ / After renaming modulo { 3->0, 1->1, 5->2, 0->3, 2->4, 4->5 }, it remains to prove termination of the 6-rule system { 0 1 2 -> 3 1 1 4 4 , 0 1 2 -> 0 1 4 4 , 5 1 ->= 1 2 , 2 ->= 5 5 5 , 4 1 4 ->= 1 5 , 1 1 2 ->= 4 1 1 4 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 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, 2->2, 4->3, 5->4 }, it remains to prove termination of the 5-rule system { 0 1 2 -> 0 1 3 3 , 4 1 ->= 1 2 , 2 ->= 4 4 4 , 3 1 3 ->= 1 4 , 1 1 2 ->= 3 1 1 3 3 } The system was filtered by the following matrix interpretation of type E_J with J = {1,...,2} and dimension 4: 0 is interpreted by / \ | 1 0 1 0 | | 0 1 0 0 | | 0 0 0 0 | | 0 0 0 0 | \ / 1 is interpreted by / \ | 1 0 0 0 | | 0 1 0 0 | | 0 0 0 1 | | 0 0 0 0 | \ / 2 is interpreted by / \ | 1 0 0 0 | | 0 1 0 0 | | 0 1 0 0 | | 0 1 0 0 | \ / 3 is interpreted by / \ | 1 0 0 0 | | 0 1 0 0 | | 0 0 0 0 | | 0 0 0 0 | \ / 4 is interpreted by / \ | 1 0 0 0 | | 0 1 0 0 | | 0 1 0 0 | | 0 0 0 0 | \ / After renaming modulo { 4->0, 1->1, 2->2, 3->3 }, it remains to prove termination of the 4-rule system { 0 1 ->= 1 2 , 2 ->= 0 0 0 , 3 1 3 ->= 1 0 , 1 1 2 ->= 3 1 1 3 3 } The system is trivially terminating.