How many movies have Piet Burnama and Ratno Timoer collaborated on?

They have worked on 14 movies together! Their first movie together was Dan Bunga-bunga Berguguran (1970) while their highest rated movie together was Gundala the Son of Lightning (1981). They have not worked together since The Blind Man from Ghost Cave: Valley of the Skeletons (1990). They are most known for their action films together.