C1212121231123232233131323223313231333132322133313232233132312121   >>    C121212123112323223313132322331323133313232213331323223313231212   <<    C1212121231123232233131323223313231333132322133313232233132312123   >>      C1212121231123232233131323223313231333132322133313232233132312122   >>