you are likely to find Change in/at/on Casino. Change is a synonym of Variety. 
Medication is related to Depression. Pit is a type of Depression. Pit is related to Camp. Camp is a type of Pitch. 
Casino <--AtLocation-- Change <--Synonym--> Variety 
Medication <--RelatedTo--> Depression <--IsA-- Pit <--RelatedTo--> Camp --IsA--> Pitch 