Drop is related to Mistake. Confusion is a type of Mistake. you are likely to find Confusion in/at/on Class. Class is related to Rich. 
Attempt is related to Effort. Effort is a synonym of Pain. Pain is related to Terrible. 
Drop <--RelatedTo--> Mistake <--IsA-- Confusion --AtLocation--> Class <--RelatedTo--> Rich 
Attempt <--RelatedTo--> Effort <--Synonym--> Pain <--RelatedTo--> Terrible 