Useful is related to Tool. you are likely to find Tool in/at/on Basement. you are likely to find Rat in/at/on Basement. Rat is related to Literature. 
Precious is etymologically related to Price. Precious is related to Gold. Gold is related to Olympic. Olympic is related to Medal. 
Useful <--RelatedTo--> Tool --AtLocation--> Basement <--AtLocation-- Rat <--RelatedTo--> Literature 
Price <--EtymologicallyRelatedTo-- Precious <--RelatedTo--> Gold <--RelatedTo--> Olympic <--RelatedTo--> Medal 