C1212121231123232233131323223313233313231313331311331323123232212321   >>    C121212123112323223313132322331323331323131333131133132312323221232   <<    C1212121231123232233131323223313233313231313331311331323123232212323   >>      C1212121231123232233131323223313233313231313331311331323123232212322   >>