How many movies have Ishmael Bernal and Nonoy Santillan collaborated on?

They have worked on 4 movies together! Their first movie together was Inspiration (1972) while their highest rated movie together was Lumapit, Lumayo ang Umaga (1975). They have not worked together since Walang Katapusang Tag-araw (1977). They are most known for their drama films together.