No | Pattern | Freq | Relations |
---|---|---|---|
1 | must [vb infin] been at [det] | 5 |
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2 | must have been at [det] | 5 |
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3 | must [verb] been at [det] | 5 |
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4 | must [verb] been at [det] | 5 |
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5 | must have been at [det] | 5 |
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