Slavery is related to Servant. Servant is related to Poor. Poor is related to Homeless. Homeless is related to Adopt. 
Edge is a synonym of Boundary. you are likely to find Boundary in/at/on Basketball. Basketball is related to Head. Head is related to Mayor. 
Slavery <--RelatedTo--> Servant <--RelatedTo--> Poor <--RelatedTo--> Homeless <--RelatedTo--> Adopt 
Edge <--Synonym--> Boundary --AtLocation--> Basketball <--RelatedTo--> Head <--RelatedTo--> Mayor 