How many movies have Hiroshi Kondō and Nobuaki Nakajima collaborated on?

They have worked on 4 movies together! Their first movie together was Karate Bear Fighter (1975) while their highest rated movie together was Which Is Stronger, Karate or the Tiger? (1976). They have not worked together since A 5,000 Kilometer Run under The Scorching Sun (1979). They are most known for their action films together.