| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [n mass] [prep] [noun sg] [noun] | 4062 |
|
| 2 | [n mass] [prep] [noun sg] [noun pl] | 2173 |
|
| 3 | [noun] [prep] [noun sg] difficulties | 224 |
|
| 4 | [n mass] [prep] [noun sg] difficulty | 88 |
|
| 5 | [n mass] [prep] [noun] difficulties | 88 |
|
