D12112221323331322331323131312323132313232233131313231323221121   >>    D1211222132333132233132313131232313231323223313131323132322112   <<    D12112221323331322331323131312323132313232233131313231323221123   >>      D12112221323331322331323131312323132313232233131313231323221122   >>