| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | introduce [prep] the [num ord] time [prep] | 8 |
|
| 2 | introduce [prep] [art] first time [prep] | 8 |
|
| 3 | introduce for [art] [num ord] time [prep] | 8 |
|
| 4 | introduced [prep] [art] [num ord] time [prep] | 7 |
|
| 5 | introduce [prep] [art] [num ord] time in | 5 |
|
