| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a initial period of | 15 |
|
| 2 | [prep] a initial period of | 15 |
|
| 3 | for a initial period of | 13 |
|
| 4 | for a initial period of | 13 |
|
| 5 | a initial period of [adj] | 16 |
|
| 6 | a initial period of [num] | 14 |
|
