C1212121231123232233131323223313233313231323222233131323132322221   >>    C121212123112323223313132322331323331323132322223313132313232222   <<    C1212121231123232233131323223313233313231323222233131323132322223   >>      C1212121231123232233131323223313233313231323222233131323132322222   >>