Telephone is related to Booth. Booth have Door. you are likely to find Lock in/at/on Door. Lock is related to Glad. 
Part is related to Degree. Degree is a synonym of Grade. 
Telephone <--RelatedTo--> Booth --HasA--> Door <--AtLocation-- Lock <--RelatedTo--> Glad 
Part <--RelatedTo--> Degree <--Synonym--> Grade 