Graduation is related to Ceremony. Ceremony is related to Official. Official is related to Form. Form is related to Figure. 
Foster is a type of Station. Station is related to Tube. 
Graduation <--RelatedTo--> Ceremony <--RelatedTo--> Official <--RelatedTo--> Form <--RelatedTo--> Figure 
Foster --IsA--> Station <--RelatedTo--> Tube 