Happen is related to Go. Go is related to Mathematics. Mathematics is related to Division. Division is related to Equation. 
Identify is a synonym of Describe. Describe is a synonym of Portray. Portray is related to Port. Port is related to Boat. 
Happen <--RelatedTo--> Go <--RelatedTo--> Mathematics <--RelatedTo--> Division <--RelatedTo--> Equation 
Identify <--Synonym--> Describe <--Synonym--> Portray <--RelatedTo--> Port <--RelatedTo--> Boat 