| produce mucus | 0.63 |
| persist for several wee… | 0.62 |
| persist for week | 0.45 |
| occur in the morning | 0.43 |
| last more than three we… | 0.36 |
| produce phlegm | 0.32 |
| produce sputum | 0.30 |
| last for month | 0.30 |
| last for more than two … | 0.25 |
| persist for longer time | 0.25 |
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