How many movies have Fortunato Arena and Gabriella Vitale collaborated on?

They have worked on 4 movies together! Their first movie together was Tequila Joe (1968) while their highest rated movie together was Franco, Ciccio e il pirata Barbanera (1969). They have not worked together since Patroclooo!... e il soldato Camillone, grande grosso e frescone (1973). They are most known for their comedy films together.