Corner is a type of Steer. you are likely to find Shelf in/at/on Corner. you are likely to find Literature in/at/on Shelf. Literature is related to Era. 
Head have Brain. Head is related to Count. Count is related to Total. 
Steer <--IsA-- Corner <--AtLocation-- Shelf <--AtLocation-- Literature <--RelatedTo--> Era 
Brain <--HasA-- Head <--RelatedTo--> Count <--RelatedTo--> Total 