| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| when was vellum invented | 1.42 | 0.4 | 4522 | 23 | 24 |
| when | 0.23 | 0.3 | 8045 | 17 | 4 |
| was | 0.08 | 0.5 | 3624 | 43 | 3 |
| vellum | 1.4 | 0.5 | 4572 | 1 | 6 |
| invented | 1.16 | 0.7 | 8203 | 32 | 8 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| when was vellum invented | 1.81 | 0.7 | 3121 | 95 |
