| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | series [prep] [noun sg] attacks [prep] | 12 |
|
| 2 | series of [noun sg] attacks [prep] | 12 |
|
| 3 | series [prep] [noun sg] attacks on | 10 |
|
| 4 | series [prep] [noun sg] attacks on | 10 |
|
