| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | not undertake the period [prep] | 5 |
|
| 2 | [adv] undertake the period of | 5 |
|
| 3 | [adv] undertake the period [prep] | 5 |
|
| 4 | [adv] undertake the period of | 5 |
|
| 5 | not undertake the period [prep] | 5 |
|
| 6 | [not/n't] undertake the period [prep] | 5 |
|
