In def CoarseSelectionFilter(self, coarse):, what is the "coarse" object within the() exactly? As far as I understand, it's a pre-made list containing all the stocks available to filter through, right? What would I have to do if I want to start with a basket of technology or energy stocks instead of a basket of all 6000+ stocks and then filter through that? Is there another object I can replace "coarse" with? What if I want to start with a pre-made list that I made myself, and have the def CoarseSelectionFilter() function filter through that pre-made list instead?