C1212121231123232233131323223313231323331323222313231323133112121   >>    C121212123112323223313132322331323132333132322231323132313311212   <<    C1212121231123232233131323223313231323331323222313231323133112123   >>      C1212121231123232233131323223313231323331323222313231323133112122   >>