| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | over [art] considerable period of [noun sg] | 7 |
|
| 2 | over a considerable period of [noun] | 7 |
|
| 3 | over [art] considerable period of time | 7 |
|
| 4 | over [art] considerable period of time | 7 |
|
| 5 | over a considerable period of [noun] | 7 |
|
| 6 | over [art] considerable period of [noun] | 7 |
|
| 7 | over [art] considerable period of [noun] | 7 |
|
