| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] [prep] a tougher | 5 |
|
| 2 | [vb pp] [prep] a tougher | 5 |
|
| 3 | [vb pp] a tougher [noun sg] | 7 |
|
| 4 | [vb pp] a tougher [noun] | 7 |
|
