CREATE TABLE table_1946 ("Period" TEXT, "Kit manufacturer" TEXT, "Main sponsor" TEXT, "Secondary sponsor" TEXT, "Minor sponsors" TEXT)

When olympikus is the main sponsor who is the secondary sponsor?
SELECT "Secondary sponsor" FROM table_1946 WHERE "Main sponsor" = 'Olympikus'
SELECT "Secondary sponsor" FROM "table_1946" WHERE "Main sponsor" = 'Olympikus'