ＣＩＴＹ
City
Volumes
| Cover | Vocabulary List | Total | Unique | Used Once | New ⓘ | Density ⓘ | |
|---|---|---|---|---|---|---|---|
| Series | 6,018 | 2,669 | 1,735 | 65% | 11.92 | ||
 |
ＣＩＴＹ（１） | 2,011 | 1,148 | 852 | 74% | 1,148 | 12.04 |
 |
ＣＩＴＹ（２） | 2,134 | 1,230 | 875 | 71% | 851 | 12.60 |
 |
ＣＩＴＹ（３） | 1,873 | 1,123 | 833 | 74% | 670 | 11.11 |