| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | depletion of the [noun sg] [noun sg] over | 5 |
|
| 2 | depletion of the [noun sg] layer over | 5 |
|
| 3 | depletion of the [noun sg] [noun sg] over | 5 |
|
| 4 | depletion of the ozone [noun sg] over | 5 |
|
