| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] long period of | 240 |
|
| 2 | [art] long period of | 207 |
|
| 3 | a long period of | 205 |
|
| 4 | a long period of | 205 |
|
| 5 | the long period of | 35 |
|
| 6 | the long period of | 35 |
|
| 7 | [art] longer period of | 23 |
|
| 8 | [art] longest period of | 10 |
|
