C1212121231123232233131323223313231333132322133313231232313232223221   >>    C121212123112323223313132322331323133313232213331323123231323222322   <<    C1212121231123232233131323223313231333132322133313231232313232223223   >>      C1212121231123232233131323223313231333132322133313231232313232223222   >>