Low is related to Deep. Deep is related to Cotton. 
Argument is a type of Variable. Argument is a different concept from Discussion. Discussion is a synonym of Treatment. Treatment is derived from Treat. 
Low <--RelatedTo--> Deep <--RelatedTo--> Cotton 
Variable <--IsA-- Argument <--DistinctFrom--> Discussion <--Synonym--> Treatment --DerivedFrom--> Treat 