| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a considerable period of | 17 |
|
| 2 | [prep] a considerable period of | 17 |
|
| 3 | for a considerable period of | 7 |
|
| 4 | over a considerable period of | 7 |
|
| 5 | over a considerable period of | 7 |
|
| 6 | for a considerable period of | 7 |
|
| 7 | a considerable period of [noun] | 22 |
|
| 8 | a considerable period of [noun sg] | 22 |
|
| 9 | a considerable period of time | 20 |
|
| 10 | a considerable period of time | 20 |
|
