Library is related to Large. Large is related to Department. Department is the opposite of Entire. 
Casual is a synonym of Random. Random is a different concept from Order. Order is a synonym of Instruction. Link is a type of Instruction. 
Library <--RelatedTo--> Large <--RelatedTo--> Department <--Antonym--> Entire 
Casual <--Synonym--> Random <--DistinctFrom--> Order <--Synonym--> Instruction <--IsA-- Link 