Leg is related to Half. Half is related to Turn. Turn is related to Changing. Changing is related to Influence. 
Challenge is a type of Demand. Demand is related to Beg. Beg is related to Please. 
Leg <--RelatedTo--> Half <--RelatedTo--> Turn <--RelatedTo--> Changing <--RelatedTo--> Influence 
Challenge --IsA--> Demand <--RelatedTo--> Beg <--RelatedTo--> Please 