you are likely to find Human in/at/on Downtown. Human is related to Leg. Leg is related to Park. you are likely to find Stranger in/at/on Park. 
Coming is related to Arrive. Arrive is related to Go. 
Downtown <--AtLocation-- Human <--RelatedTo--> Leg <--RelatedTo--> Park <--AtLocation-- Stranger 
Coming <--RelatedTo--> Arrive <--RelatedTo--> Go 