C1212121231123232233131323223313231323331323221331123231323132313211   >>    C121212123112323223313132322331323132333132322133112323132313231321   <<    C1212121231123232233131323223313231323331323221331123231323132313213   >>      C1212121231123232233131323223313231323331323221331123231323132313212   >>