| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | period of [noun sg] [art] [noun sg] | 30 |
|
| 2 | period of [noun] the [noun sg] | 22 |
|
| 3 | period of time [art] [noun sg] | 15 |
|
| 4 | period of time [art] [noun sg] | 15 |
|
| 5 | period of [noun] a [noun sg] | 5 |
|
