| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | [noun prp] a [adj] years [adv] | 62 |
|
| 2 | [noun] a [adj] years back | 28 |
|
| 3 | [noun prp] a [adj] [noun pl] back | 16 |
|
| 4 | [noun prp] a [adj] [noun] back | 16 |
|
| 5 | [noun prp] a [adj] years [adv prt] | 14 |
|
| 6 | [noun prp] a [adj] years back | 14 |
|
| 7 | [noun prp] a [adj] year back | 14 |
|
| 8 | [noun prp] [art] [adj] years back | 14 |
|
