Useful is related to Can. you are likely to find Lip in/at/on Can. 
Look is related to Rear. Rear is related to Bottom. Bottom is related to Chair. Wheelchair is a type of Chair. 
Useful <--RelatedTo--> Can <--AtLocation-- Lip 
Look <--RelatedTo--> Rear <--RelatedTo--> Bottom <--RelatedTo--> Chair <--IsA-- Wheelchair 