| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| unit of natural frequency | 1.47 | 0.1 | 9690 | 91 | 25 |
| unit | 0.22 | 0.6 | 7345 | 67 | 4 |
| of | 1.28 | 0.9 | 7127 | 68 | 2 |
| natural | 1.18 | 0.6 | 2417 | 88 | 7 |
| frequency | 0.83 | 0.8 | 5426 | 98 | 9 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| unit of natural frequency | 0.08 | 0.6 | 8732 | 40 |
