| Keyword | CPC | PCC | Volume | Score | Length of keyword |
|---|---|---|---|---|---|
| four types of membranes | 0.47 | 0.2 | 3507 | 8 | 23 |
| four | 0.17 | 0.7 | 2553 | 63 | 4 |
| types | 0.67 | 0.4 | 7532 | 11 | 5 |
| of | 1.82 | 0.5 | 116 | 20 | 2 |
| membranes | 1.67 | 0.1 | 2741 | 64 | 9 |
| Keyword | CPC | PCC | Volume | Score |
|---|---|---|---|---|
| four types of membranes | 1.19 | 0.2 | 5378 | 80 |
