| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [art] period | 7845 |
|
| 2 | the period | 4550 |
|
| 3 | the period | 4550 |
|
| 4 | a period | 3270 |
|
| 5 | a period | 3268 |
|
| 6 | no period | 13 |
|
| 7 | no period | 13 |
|
| 8 | every period | 12 |
|
| 9 | every period | 12 |
|
