Number is a synonym of Issue. Issue is a synonym of Emerge. Emerge is a synonym of Escape. Escape is related to Bolt. 
Controversial is derived from Controversy. Fight is a type of Controversy. Engage is a type of Fight. 
Number <--Synonym--> Issue <--Synonym--> Emerge <--Synonym--> Escape <--RelatedTo--> Bolt 
Controversial --DerivedFrom--> Controversy <--IsA-- Fight <--IsA-- Engage 