Assertion: bronchitis's symptom | /r/HasProperty | productive
Facets:
value: usually
type: DEGREE
Source sentences:
text: The most common symptom is a nagging, cough that is usually productive.
text: The main symptom of bronchitis, whether acute or chronic, is a productive cough.
text: The main symptom of bronchitis is a cough that is persistent and productive (brings up phlegm).