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