C11231123231313231323131323132322331323331323221313231323123121   >>    C1123112323131323132313132313232233132333132322131323132312312   <<    C11231123231313231323131323132322331323331323221313231323123123   >>      C11231123231313231323131323132322331323331323221313231323123122   >>