| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [prep] a long period of | 152 |
|
| 2 | [prep] a long period of | 152 |
|
| 3 | over a long period of | 84 |
|
| 4 | over a long period of | 84 |
|
| 5 | for a long period of | 21 |
|
| 6 | for a long period of | 21 |
|
| 7 | after a long period of | 16 |
|
| 8 | [verb] a long period of | 16 |
|
| 9 | after a long period of | 16 |
|
| 10 | [adv] a long period of | 12 |
|
| 11 | of a long period of | 11 |
|
| 12 | of a long period of | 11 |
|
| 13 | over a long period of | 8 |
|
| 14 | [adv prt] a long period of | 8 |
|
| 15 | over a long period of | 8 |
|
| 16 | [be] a long period of | 7 |
|
| 17 | be a long period of | 7 |
|
| 18 | [conj] a long period of | 6 |
|
| 19 | such a long period of | 5 |
|
| 20 | such a long period of | 5 |
|
| 21 | [adj] a long period of | 5 |
|
| 22 | [det] a long period of | 5 |
|
| 23 | to a long period of | 5 |
|
| 24 | [vb pp] a long period of | 5 |
|
| 25 | to a long period of | 5 |
|
| 26 | a [adv] long period of | 17 |
|
| 27 | a [adv] long period of | 17 |
|
| 28 | a very long period of | 7 |
|
| 29 | a very long period of | 7 |
|
| 30 | a long period of [noun] | 169 |
|
