| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | a [n mass] of [noun pl] on | 180 |
|
| 2 | a [n mass] [prep] [noun pl] on | 180 |
|
| 3 | a series [prep] [noun pl] on | 164 |
|
| 4 | a [n mass] [prep] attacks on | 20 |
|
| 5 | a pair [prep] [noun pl] on | 16 |
|
| 6 | a [n mass] [prep] articles on | 14 |
|
| 7 | a [n mass] [prep] lectures on | 13 |
|
| 8 | a [n mass] [prep] raids on | 10 |
|
| 9 | a [n mass] [prep] seminars on | 6 |
|
