PMC:1064854 / 11477-11480 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T7840","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"− a"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T7600","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"− a"}