| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | by [noun prp] [prep] the [num ord] century | 20 |
|
| 2 | by [noun prp] [prep] the [adj] century | 20 |
|
| 3 | by [noun prp] in the [adj] century | 17 |
|
| 4 | by [noun prp] in the [adj] century | 17 |
|
