| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | date back to the [adj] century | 6 |
|
| 2 | date [adv prt] to the [num ord] century | 6 |
|
| 3 | date [adv prt] to the [adj] century | 6 |
|
| 4 | date [adv prt] to the [adj] century | 6 |
|
