user: Question: When Olympikus is the main sponsor who is the secondary sponsor?
Columns: ['Period', 'Kit manufacturer', 'Main sponsor', 'Secondary sponsor', 'Minor sponsors']
Types: ['text', 'text', 'text', 'text', 'text']
Sample row: ['1980–84', 'Adidas', 'none', 'none', 'none']
SQL:

assistant: SELECT "Secondary sponsor" FROM "Table" WHERE "Main sponsor" = 'Olympikus';