| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | obtain from [noun pl] | 127 |
|
| 2 | obtained from [noun pl] | 121 |
|
| 3 | obtain from patients | 14 |
|
| 4 | obtain from plants | 6 |
|
| 5 | obtain from rats | 5 |
|
