PMC:1315279 / 640-642 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T366","span":{"begin":0,"end":1},"obj":"SYM"}],"text":"− "}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T154","span":{"begin":0,"end":1},"obj":"SO_EXT:sequence_nullness_or_absence"}],"text":"− "}