Question: Which viewers have the language of troff (typesetter runoff) , groff (GNU runoff)?
SQL: SELECT "Viewer" FROM "1-1574968-1" WHERE "Language" = 'troff (typesetter runoff) , groff (GNU runoff)';

Question: Who is the creator when the view happens to GDDM, AFP viewer?
SQL: SELECT "Creator" FROM "1-1574968-1" WHERE "Viewer" = 'GDDM, AFP viewer';