| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun] [prep] a considerable period of | 6 |
|
| 2 | [noun sg] [prep] a considerable period of | 5 |
|
| 3 | [prep] a considerable period of [noun] | 17 |
|
| 4 | [prep] a considerable period of [noun sg] | 17 |
|
| 5 | [prep] a considerable period of time | 15 |
|
| 6 | [prep] a considerable period of time | 15 |
|
