Ear is etymologically related to Edge. 
you are likely to find Human in/at/on Thought. you are likely to find Human in/at/on Command. Command is related to Chain. you are likely to find Chain in/at/on Shed. 
Edge <--EtymologicallyRelatedTo-- Ear 
Thought <--AtLocation-- Human --AtLocation--> Command <--RelatedTo--> Chain --AtLocation--> Shed 