PMC:1540739 / 18810-18811 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T12644","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T11594","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}