C1212121231123232233131323223313233313231313331311331323331323131221   >>    C121212123112323223313132322331323331323131333131133132333132313122   <<    C1212121231123232233131323223313233313231313331311331323331323131223   >>      C1212121231123232233131323223313233313231313331311331323331323131222   >>