Assertion: mouth ulcer | /r/HasProperty | serious underlying cause
Facets:
value: usually
type: DEGREE
Source sentences:
text: Mouth ulcers are very common, occurring in association with many diseases and by many different mechanisms, but usually there is no serious underlying cause.
text: Mouth ulcers are very common, occurring in association with many diseases and by many different mechanisms, but usually there is no serious underlying cause.