| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | once or [adv] a [noun sg] [prep] | 17 |
|
| 2 | once or [adv] [art] [noun sg] [prep] | 17 |
|
| 3 | once or [adv] a [noun sg] [prep] | 17 |
|
| 4 | once or [adv] [art] [noun sg] [prep] | 17 |
|
| 5 | once or [adv] [art] [noun sg] [prep] | 17 |
|
| 6 | once or twice [art] [noun sg] [prep] | 16 |
|
| 7 | once or [adv] [art] week [prep] | 9 |
|
| 8 | once or [adv] [art] year [prep] | 5 |
|
