Space can be used for Item. Item is related to Key. Key is a type of Device. Stove is a type of Device. 
Bad is related to Problem. Problem is related to Dilemma. 
Space --UsedFor--> Item <--RelatedTo--> Key --IsA--> Device <--IsA-- Stove 
Bad <--RelatedTo--> Problem <--RelatedTo--> Dilemma 