Assertion: atrial fibrillation's symptom | /r/CapableOf | vary in frequency
Facets:
Source sentences:
text: are symptom-free, and the condition may be discovered during a physical examination, but many others experience one or more symptoms that vary in frequency and severity.
text: are symptom free and the condition may be discovered during a physical examination, but many others experience 1 or more symptoms that vary in frequency and severity.