Can is related to Might. Might is related to Happen. Fall is a type of Happen. Fall is related to Brown. 
Depression is related to Deep. Deep is related to Cut. Cut is the opposite of Seal. Seal is a synonym of Block. 
Can <--RelatedTo--> Might <--RelatedTo--> Happen <--IsA-- Fall <--RelatedTo--> Brown 
Depression <--RelatedTo--> Deep <--RelatedTo--> Cut <--Antonym--> Seal <--Synonym--> Block 