Master is related to Scholar. Scholar is related to Class. Poem can be used for Class. 
Arab is a type of Human. Chinese is a type of Human. Chinese is related to Silk. you are likely to find Silk in/at/on Tie. 
Master <--RelatedTo--> Scholar <--RelatedTo--> Class <--UsedFor-- Poem 
Arab --IsA--> Human <--IsA-- Chinese <--RelatedTo--> Silk --AtLocation--> Tie 