| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a [adj] period of | 618 |
|
| 2 | [prep] a [adj] period of | 618 |
|
| 3 | for a [adj] period of | 214 |
|
| 4 | for a [adj] period of | 214 |
|
| 5 | [verb] a [adj] period of | 150 |
|
| 6 | over a [adj] period of | 143 |
|
| 7 | over a [adj] period of | 143 |
|
| 8 | after a [adj] period of | 71 |
|
| 9 | after a [adj] period of | 71 |
|
| 10 | [adv] a [adj] period of | 45 |
|
| 11 | [conj] a [adj] period of | 42 |
|
| 12 | [be] a [adj] period of | 39 |
|
| 13 | be a [adj] period of | 39 |
|
| 14 | [vb past] a [adj] period of | 39 |
|
| 15 | of a [adj] period of | 29 |
|
| 16 | of a [adj] period of | 29 |
|
| 17 | in a [adj] period of | 29 |
|
| 18 | in a [adj] period of | 29 |
|
| 19 | within a [adj] period of | 25 |
|
| 20 | within a [adj] period of | 25 |
|
| 21 | [v-ing] a [adj] period of | 23 |
|
| 22 | [adv prt] a [adj] period of | 21 |
|
| 23 | [adv] a [adj] period of | 20 |
|
| 24 | [to-vb] a [adj] period of | 19 |
|
| 25 | to a [adj] period of | 19 |
|
| 26 | [vb infin] a [adj] period of | 19 |
|
| 27 | to a [adj] period of | 19 |
|
| 28 | over a [adj] period of | 18 |
|
| 29 | [vb base] a [adj] period of | 18 |
|
| 30 | have a [adj] period of | 18 |
|
