user: Question: What is the nickname of the team who was in the GFL from 1986-1988?
Columns: ['Club', 'Nickname', 'Location', 'GFL Premierships', 'Years in GFL']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['Barwon', 'Bulldogs', 'Belmont, Victoria', 'Nil', '1979-1989']
SQL:

assistant: SELECT "Nickname" FROM "Table" WHERE "Years in GFL" = '1986-1988';