Mandate is related to Law. Law is related to Regulation. Regulation is related to Safety. 
Buy is related to Guy. Guy is related to Prisoner. you are likely to find Prisoner in/at/on Cell. 
Mandate <--RelatedTo--> Law <--RelatedTo--> Regulation <--RelatedTo--> Safety 
Buy <--RelatedTo--> Guy <--RelatedTo--> Prisoner --AtLocation--> Cell 