How many movies have Kauko Kokkonen and Yrjö Kostermaa collaborated on?

They have worked on 3 movies together! Their first movie together was Helmikuun manifesti (1939) while their highest rated movie together was Herrojen Eeva (1954). They have not worked together since Isaskar Keturin ihmeelliset seikkailut (1960). They are most known for their comedy films together.