you are likely to find Feather in/at/on Cap. you are likely to find Feather in/at/on Cage. you are likely to find Cat in/at/on Cage. Cat wants (to) Food. 
Person does not want (to) Difficulty. 
Cap <--AtLocation-- Feather --AtLocation--> Cage <--AtLocation-- Cat --Desires--> Food 
Person --NotDesires--> Difficulty 