you are likely to find Gentleman in/at/on Meeting. Gentleman is derived from Gentle. Gentle is related to Like. Like is related to Slip. 
you are likely to find Stranger in/at/on Town. you are likely to find Police in/at/on Town. Police is a type of Human. Human is related to Cell. 
Meeting <--AtLocation-- Gentleman --DerivedFrom--> Gentle <--RelatedTo--> Like <--RelatedTo--> Slip 
Stranger --AtLocation--> Town <--AtLocation-- Police --IsA--> Human <--RelatedTo--> Cell 