you are likely to find Human in/at/on Prison. you are likely to find Human in/at/on Suit. Suit is related to Outfit. 
Trend is related to People. you are likely to find People in/at/on Classroom. Classroom can be used for Teaching. Teaching is related to Professor. 
Prison <--AtLocation-- Human --AtLocation--> Suit <--RelatedTo--> Outfit 
Trend <--RelatedTo--> People --AtLocation--> Classroom --UsedFor--> Teaching <--RelatedTo--> Professor 