Private is related to Detective. Detective is related to Glass. 
Qualify is a synonym of Characterize. Define is a type of Characterize. Define is related to Explain. Explain is related to Teaching. 
Private <--RelatedTo--> Detective <--RelatedTo--> Glass 
Qualify <--Synonym--> Characterize <--IsA-- Define <--RelatedTo--> Explain <--RelatedTo--> Teaching 