Dark is related to Oil. Oil is related to Controversy. Controversy is a synonym of Argument. 
you are likely to find Bathroom in/at/on Gym. you are likely to find Bathroom in/at/on Flat. Flat is a type of House. House is related to Offer. 
Dark <--RelatedTo--> Oil <--RelatedTo--> Controversy <--Synonym--> Argument 
Gym <--AtLocation-- Bathroom --AtLocation--> Flat --IsA--> House <--RelatedTo--> Offer 