Yard is related to Carpet. you are likely to find Carpet in/at/on Airport. you are likely to find Chair in/at/on Airport. Chair is related to Sofa. 
Flat is a type of House. House is related to Stone. Stone is related to Rolling. 
Yard <--RelatedTo--> Carpet --AtLocation--> Airport <--AtLocation-- Chair <--RelatedTo--> Sofa 
Flat --IsA--> House <--RelatedTo--> Stone <--RelatedTo--> Rolling 