| 1 | Do You Know These Roman Numbers? | |
| 2 | Zero is the only number that cannot be represented by Roman numerals. | |
| 3 | Romaji information could not be loaded, so Romaji conversion cannot be used. | |
| 4 | Romaji information file not installed, so Romaji conversion cannot be used. | |
| 5 | Learning Efficiencies for Different Orthographies: A Comparative Study of Han Characters and Vietnamese Romanization. |