How many movies have Fritz Lang and Robert Forster-Larrinaga collaborated on?

They have worked on 4 movies together! Their first movie together was Four Around the Woman (1921) while their highest rated movie together was Dr. Mabuse, the Gambler (1922). They have not worked together since Dr. Mabuse, the Gambler: Part 2 – Inferno (1922). They are most known for their thriller films together.