| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] a long period [prep] | 6 |
|
| 2 | [adj] a long period [prep] | 6 |
|
| 3 | [adj] a long period of | 5 |
|
| 4 | [adj] a long period of | 5 |
|
| 5 | [prep] [adj] a long period | 10 |
|
| 6 | [prep] [adj] a long period | 10 |
|
| 7 | over [adj] a long period | 5 |
|
| 8 | over [adj] a long period | 5 |
|
| 9 | [adj] [prep] a long period | 17 |
|
| 10 | [adj] [prep] a long period | 17 |
|
| 11 | [adj] for a long period | 11 |
|
| 12 | [adj] for a long period | 11 |
|
| 13 | [adj] over a long period | 6 |
|
| 14 | [adj] over a long period | 6 |
|
