Number is related to Guest. Guest is related to Hotel. you are likely to find Elevator in/at/on Hotel. you are likely to find Elevator in/at/on Apartment. 
Potato is related to Roll. Roll is a synonym of Bowl. Bowl is related to Bottom. Bottom is related to Button. 
Number <--RelatedTo--> Guest <--RelatedTo--> Hotel <--AtLocation-- Elevator --AtLocation--> Apartment 
Potato <--RelatedTo--> Roll <--Synonym--> Bowl <--RelatedTo--> Bottom <--RelatedTo--> Button 