| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | thirty seconds [noun sg] [prep] | 6 |
|
| 2 | thirty seconds [noun sg] of | 6 |
|
| 3 | thirty seconds [noun sg] of | 6 |
|
| 4 | thirty seconds [noun sg] [prep] | 6 |
|
