How many movies have Ernst Hofbauer and Kurt Seelmann collaborated on?

They have worked on 4 movies together! Their first movie together was Schoolgirl Report Part 1: What Parents Don't Think Is Possible (1970) while their highest rated movie together was Schoolgirl Report Part 5: What All Parents Should Know (1973). They have not worked together since Schoolgirl Report Part 11: Trying Beats Studying (1977). They are most known for their drama films together.