How many movies have Osamu Tanaka and Shunya Ito collaborated on?

They have worked on 4 movies together! Their first movie together was Patience Has An End (1971) while their highest rated movie together was Female Prisoner Scorpion: Jailhouse 41 (1972). They have not worked together since Female Prisoner Scorpion: Beast Stable (1973). They are most known for their crime films together.