Wear is related to Eye. Eye is related to Drop. Tear is a type of Drop. 
you are likely to find Carpet in/at/on Bedroom. Bedroom have Floor. Floor is related to Main. 
Wear <--RelatedTo--> Eye <--RelatedTo--> Drop <--IsA-- Tear 
Carpet --AtLocation--> Bedroom --HasA--> Floor <--RelatedTo--> Main 