C1212121231123232233131323223313231323331323222313231323133112312121   >>    C121212123112323223313132322331323132333132322231323132313311231212   <<    C1212121231123232233131323223313231323331323222313231323133112312123   >>      C1212121231123232233131323223313231323331323222313231323133112312122   >>