Depressed is related to Blue. Blue is related to Red. Red is related to Apple. 
Challenge is a synonym of Dispute. Dispute is related to War. War is related to Camp. Camp is related to Outside. 
Depressed <--RelatedTo--> Blue <--RelatedTo--> Red <--RelatedTo--> Apple 
Challenge <--Synonym--> Dispute <--RelatedTo--> War <--RelatedTo--> Camp <--RelatedTo--> Outside 