| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [adj] period [prep] [noun sg] | 612 |
|
| 2 | [adv prt] a [adj] period [prep] | 23 |
|
| 3 | [adv prt] a period [prep] [noun sg] | 18 |
|
| 4 | [adv prt] a [adj] [prep] [noun sg] | 6 |
|
