C1212121231123232233131323223313231333132322133313231313231323121   >>    C121212123112323223313132322331323133313232213331323131323132312   <<    C1212121231123232233131323223313231333132322133313231313231323123   >>      C1212121231123232233131323223313231333132322133313231313231323122   >>