PMC:1626108 / 1607-1608 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T512","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"−"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T209","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"−"}