Which viewers have the language of troff (typesetter runoff) , groff (gnu runoff)?
CREATE TABLE table_1574968_1 (viewer VARCHAR, language VARCHAR)
SELECT viewer FROM table_1574968_1 WHERE language = "troff (typesetter runoff) , groff (GNU runoff)"
### Context: CREATE TABLE table_1574968_1 (viewer VARCHAR, language VARCHAR) ### Question: Which viewers have the language of troff (typesetter runoff) , groff (gnu runoff)? ### Answer: SELECT viewer FROM table_1574968_1 WHERE language = "troff (typesetter runoff) , groff (GNU runoff)"