| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [verb] developed [prep] recent years | 7 |
|
| 2 | have developed [prep] recent years | 7 |
|
| 3 | [be] developed [prep] recent years | 6 |
|
| 4 | [been] developed [prep] recent years | 6 |
|
| 5 | be developed [prep] recent years | 6 |
|
| 6 | been developed [prep] recent years | 6 |
|
