C1212121231123232233131323223313231323331323121133132313231323211   >>    C121212123112323223313132322331323132333132312113313231323132321   <<    C1212121231123232233131323223313231323331323121133132313231323213   >>      C1212121231123232233131323223313231323331323121133132313231323212   >>