PMC:1440874 / 31864-31865 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T6515","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T6298","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}