| No | Pattern | Freq | Relations |
|---|---|---|---|
| 1 | must [vb infin] been [det] [noun] | 50 |
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| 2 | [vb infin] been [det] [noun] [Wh pn] | 8 |
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must [vb infin] been [det] [noun] [Wh pn] Next page
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