ＲＩＤＥＢＡＣＫ
Volumes
| Cover | Vocabulary List | Total | Unique | Used Once | New ⓘ | Density ⓘ | |
|---|---|---|---|---|---|---|---|
| Series | 10,031 | 3,938 | 2,396 | 60% | 16.84 | ||
|
ＲＩＤＥＢＡＣＫ（１） | 3,837 | 2,009 | 1,391 | 69% | 2,008 | 18.63 |
|
ＲＩＤＥＢＡＣＫ（２） | 3,399 | 1,879 | 1,359 | 72% | 1,151 | 17.17 |
|
ＲＩＤＥＢＡＣＫ（３） | 2,795 | 1,610 | 1,173 | 72% | 777 | 14.71 |