CREATE TABLE table_31963 ("Calls" TEXT, "Frequency" TEXT, "Branding" TEXT, "Format" TEXT, "Timeslot" TEXT, "Group owner" TEXT)

Tell me the timeslot of calls of wrko
SELECT "Timeslot" FROM table_31963 WHERE "Calls" = 'wrko'
SELECT "Timeslot" FROM "table_31963" WHERE "Calls" = 'wrko'