user: Question: Which Away team that has a Crowd greater than 15481, and a Home team score of 20.17 (137)?
Columns: ['Home team', 'Home team score', 'Away team', 'Away team score', 'Venue', 'Crowd', 'Date']
Types: ['text', 'text', 'text', 'text', 'text', 'real', 'text']
Sample row: ['North Melbourne', '19.24 (138)', 'South Melbourne', '12.16 (88)', 'Arden Street Oval', 16015.0, '5 May 1979']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Crowd" > 15481.0 AND "Home team score" = '20.17 (137)';