you are likely to find Door in/at/on Classroom. Door is related to House. House is made of Wood. 
Big is related to Bed. you are likely to find Book in/at/on Bed. Book is related to Matter. 
Classroom <--AtLocation-- Door <--RelatedTo--> House --MadeOf--> Wood 
Big <--RelatedTo--> Bed <--AtLocation-- Book <--RelatedTo--> Matter 