| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [vb pp] at an [adj] [noun sg] | 228 |
|
| 2 | [vb pp] at an early [noun sg] | 110 |
|
| 3 | [vb pp] at an early [noun sg] | 81 |
|
| 4 | [vb pp] at an [adj] stage | 78 |
|
| 5 | [vb pp] at an earlier [noun sg] | 29 |
|
| 6 | [vb pp] at an [adj -er] [noun sg] | 29 |
|
| 7 | [vb pp] at an [adj] rate | 28 |
|
| 8 | [vb pp] at an [adj] age | 16 |
|
| 9 | [vb pp] at an [adj] level | 12 |
|
| 10 | [vb pp] at an [adj] meeting | 12 |
|
| 11 | [vb pp] at an [adj] cost | 11 |
|
| 12 | taken at an [adj] [noun sg] | 10 |
|
| 13 | [vb pp] at an appropriate [noun sg] | 9 |
|
| 14 | [vb pp] at an appropriate [noun sg] | 9 |
|
| 15 | made at an [adj] [noun sg] | 8 |
|
| 16 | [vb pp] at an [adj] time | 7 |
|
| 17 | [vb pp] at an initial [noun sg] | 7 |
|
| 18 | [vb pp] at an initial [noun sg] | 7 |
|
| 19 | [vb pp] at an alarming [noun sg] | 6 |
|
| 20 | introduced at an [adj] [noun sg] | 6 |
|
| 21 | [vb pp] at an [adj] date | 6 |
|
| 22 | discussed at an [adj] [noun sg] | 6 |
|
| 23 | [vb pp] at an average [noun sg] | 6 |
|
| 24 | [vb pp] at an alarming [noun sg] | 6 |
|
| 25 | [vb pp] at an average [noun sg] | 6 |
|
| 26 | [vb pp] at an international [noun sg] | 5 |
|
| 27 | [vb pp] at an annual [noun sg] | 5 |
|
| 28 | held at an [adj] [noun sg] | 5 |
|
| 29 | [vb pp] at an annual [noun sg] | 5 |
|
| 30 | [vb pp] at an informal [noun sg] | 5 |
|
