No | Pattern | Freq | Relations |
---|---|---|---|
1 | [noun sg] have been operating | 25 |
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2 | [noun sg] [vb -s] been operating | 16 |
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3 | [noun sg] has been operating | 16 |
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4 | [noun sg] had been operating | 6 |
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5 | [noun sg] [vb past] been operating | 6 |
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