| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] [art] considerable period of time | 15 |
|
| 2 | [prep] a considerable period of time | 15 |
|
| 3 | [prep] [art] considerable period of time | 15 |
|
| 4 | for [art] considerable period of time | 7 |
|
| 5 | over [art] considerable period of time | 7 |
|
| 6 | over [art] considerable period of time | 7 |
|
| 7 | for [art] considerable period of time | 7 |
|
