Streak is a type of Flash. Streak is a different concept from River. 
you are likely to find Mathematics in/at/on University. Mathematics is related to Divide. Divide is a synonym of Share. Share is a synonym of Deal. 
Flash <--IsA-- Streak <--DistinctFrom--> River 
University <--AtLocation-- Mathematics <--RelatedTo--> Divide <--Synonym--> Share <--Synonym--> Deal 