Exchange is related to Shop. Shop is related to Building. you are likely to find Dust in/at/on Building. 
Breathe is a synonym of Rest. Rest is a synonym of Ease. Ease is a different concept from Difficulty. Killer is a type of Difficulty. 
Exchange <--RelatedTo--> Shop <--RelatedTo--> Building <--AtLocation-- Dust 
Breathe <--Synonym--> Rest <--Synonym--> Ease <--DistinctFrom--> Difficulty <--IsA-- Killer 