Letter is related to Card. Card is related to Flat. Flat is related to Wall. Wall is a type of Boundary. 
Fixed is a synonym of Still. Still is the opposite of Landscape. Landscape is related to Yard. you are likely to find Wagon in/at/on Yard. 
Letter <--RelatedTo--> Card <--RelatedTo--> Flat <--RelatedTo--> Wall --IsA--> Boundary 
Fixed <--Synonym--> Still <--Antonym--> Landscape <--RelatedTo--> Yard <--AtLocation-- Wagon 