Room is related to Crowd. Crowd is related to Mess. 
Laundry is a type of Workplace. you are likely to find Iron in/at/on Laundry. Irony is derived from Iron. Irony is related to Joke. 
Room <--RelatedTo--> Crowd <--RelatedTo--> Mess 
Workplace <--IsA-- Laundry <--AtLocation-- Iron <--DerivedFrom-- Irony <--RelatedTo--> Joke 