user: Question: Who were the away team in tie number 20?
Columns: ['Tie no', 'Home team', 'Score', 'Away team', 'Attendance']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1', 'Enfield', '1–1', 'Peterborough United', '7 December 1996']
SQL:

assistant: SELECT "Away team" FROM "Table" WHERE "Tie no" = '20';