| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [adj] period of [noun sg] | 1152 |
|
| 2 | a [adj] period of | 842 |
|
| 3 | a period of [noun sg] | 770 |
|
| 4 | a [adj] of [noun sg] | 101 |
|
| 5 | a [adj] period [noun sg] | 24 |
|
