| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [conj] of [art] [noun] of | 2591 |
|
| 2 | [conj] of [art] difficulty [prep] | 74 |
|
| 3 | [conj] [prep] [art] difficulty of | 59 |
|
| 4 | [conj] [prep] [art] difficulty of | 59 |
|
| 5 | [conj] of [art] difficulty of | 48 |
|
