C1212121231123232233131323223313233313231313331311331323123232223221   >>    C121212123112323223313132322331323331323131333131133132312323222322   <<    C1212121231123232233131323223313233313231313331311331323123232223223   >>      C1212121231123232233131323223313233313231313331311331323123232223222   >>