I want to know the answer to the following question:
Which two artists did Douglass Cooper say were very important to the forming of Cubism?
All the background I'm provided with is that "Nevertheless, the Demoiselles is the logical picture to take as the starting point for Cubism, because it marks the birth of a new pictorial idiom, because in it Picasso violently overturned established conventions and because all that followed grew out of it."". Is that enough to answer the question?