| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] an estimated [adj] per | 24 |
|
| 2 | [prep] an estimated [adj] per | 24 |
|
| 3 | [prep] an estimated [num] per | 24 |
|
| 4 | by an estimated [adj] per | 8 |
|
| 5 | by an estimated [adj] per | 8 |
|
