Mainstream is a synonym of Common. Common is similar to Standard. Standard is a synonym of Average. 
Impact is a synonym of Shock. Shock is related to Discovery. Determination is a type of Discovery. Determination is a synonym of Decision. 
Mainstream <--Synonym--> Common <--SimilarTo--> Standard <--Synonym--> Average 
Impact <--Synonym--> Shock <--RelatedTo--> Discovery <--IsA-- Determination <--Synonym--> Decision 