C1212121231123232233131323223313233313233313223313231323131123313131211   >>    C121212123112323223313132322331323331323331322331323132313112331313121   <<    C1212121231123232233131323223313233313233313223313231323131123313131213   >>      C1212121231123232233131323223313233313233313223313231323131123313131212   >>