How many movies have Humberto Cornejo and Petra de Nieva collaborated on?

They have worked on 9 movies together! Their first movie together was Siempre vuelven de madrugada (1949) while their highest rated movie together was Los subdesarrollados (1968). They have not worked together since Tocata y fuga de Lolita (1974). They are most known for their comedy films together.