Exchange is a type of Capture. Exchange is related to Buy. Buy is related to Price. 
Unlike is related to Different. Different is a different concept from Usual. Usual is a synonym of Plain. 
Capture <--IsA-- Exchange <--RelatedTo--> Buy <--RelatedTo--> Price 
Unlike <--RelatedTo--> Different <--DistinctFrom--> Usual <--Synonym--> Plain 