| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | account for [adv] [n mass] of | 8 |
|
| 2 | account for [adv] [n mass] [prep] | 8 |
|
| 3 | account for about [n mass] [prep] | 5 |
|
| 4 | account for about [n mass] [prep] | 5 |
|
