Ambassador is related to Foreign. Foreign is related to Correspondent. Correspondent is related to Associate. Associate is a synonym of Companion. 
Book can be used for Education. Silk is a type of Book. Silk is related to Expense. 
Ambassador <--RelatedTo--> Foreign <--RelatedTo--> Correspondent <--RelatedTo--> Associate <--Synonym--> Companion 
Education <--UsedFor-- Book <--IsA-- Silk <--RelatedTo--> Expense 