| No | Pattern | Freq | Relations |
|---|---|---|---|
| 31 | a long period of [noun sg] | 164 |
|
| 32 | a long period of time | 115 |
|
| 33 | a long period of time | 115 |
|
| 34 | a long period of [adj] | 26 |
|
| 35 | a long period of [adj] | 25 |
|
| 36 | a long period of [noun pl] | 5 |
|
