Assertion: contralto's role | /r/HasProperty | ina/etta roles
Facets:
value: casually
type: MANNER
value: due to many character names
type: CAUSE
value: sometimes
type: TEMPORAL
Source sentences:
text: These roles are sometimes casually referred to as "ina/etta roles" due to many character names ending in these suffixes (Zerlina, Gianetta, Serpina, Nannetta).