PMC:1584416 / 5059-5067 JSONTXT

{"project":"craft-sa-dev","denotations":[{"id":"T1133","span":{"begin":2,"end":6},"obj":"JJ"}],"text":"r null c"}

{"project":"craft-ca-core-ex-dev","denotations":[{"id":"T550","span":{"begin":2,"end":6},"obj":"SO_EXT:sequence_nullness"}],"text":"r null c"}