Sport is a type of Exercise. Swimming can Sport. 
Plead is related to Beg. Beg is a type of Request. Challenge is a type of Request. Challenge is related to Debate. 
Exercise <--IsA-- Sport <--CapableOf-- Swimming 
Plead <--RelatedTo--> Beg --IsA--> Request <--IsA-- Challenge <--RelatedTo--> Debate 