C1212121231123232233131323223313233313233313223313123231323132313231211   >>    C121212123112323223313132322331323331323331322331312323132313231323121   <<    C1212121231123232233131323223313233313233313223313123231323132313231213   >>      C1212121231123232233131323223313233313233313223313123231323132313231212   >>