PMC:1315279 / 438-441 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T316","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"− m"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T146","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"− m"}