Instrument is related to Bed. you are likely to find Sweat in/at/on Bed. Sweat is related to Cool. 
Commercial is related to Trade. Custom is a type of Trade. Custom is a synonym of Fashion. Tie is a type of Fashion. 
Instrument <--RelatedTo--> Bed <--AtLocation-- Sweat <--RelatedTo--> Cool 
Commercial <--RelatedTo--> Trade <--IsA-- Custom <--Synonym--> Fashion <--IsA-- Tie 