| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | an average of [adv] [n mass] [prep] | 6 |
|
| 2 | [art] average of [adv] [n mass] [prep] | 6 |
|
| 3 | a average of [adv] [n mass] [prep] | 6 |
|
| 4 | [art] average of [adv] [n mass] [prep] | 6 |
|
