| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun sg] [coord] [prep] a period of | 10 |
|
| 2 | [noun sg] [coord] [prep] a period of | 10 |
|
| 3 | [noun sg] [coord] [prep] [art] period of | 10 |
|
| 4 | [noun sg] [coord] [prep] [art] period of | 10 |
|
| 5 | [noun sg] and [prep] [art] period of | 8 |
|
| 6 | [noun sg] [coord] over [art] period of | 5 |
|
