Title is related to Degree. Degree is related to Piece. 
Gas is related to Motor. Motor is related to Fan. you are likely to find Fan in/at/on Bedroom. you are likely to find Window in/at/on Bedroom. 
Title <--RelatedTo--> Degree <--RelatedTo--> Piece 
Gas <--RelatedTo--> Motor <--RelatedTo--> Fan --AtLocation--> Bedroom <--AtLocation-- Window 