PMC:1084331 / 22269-22270 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T7253","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T6465","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}