Doctor is related to Medical. Medical is related to Health. Health is related to Welfare. Welfare is related to Assistance. 
Basketball can be used for Passing. Basketball is related to Association. 
Doctor <--RelatedTo--> Medical <--RelatedTo--> Health <--RelatedTo--> Welfare <--RelatedTo--> Assistance 
Passing <--UsedFor-- Basketball <--RelatedTo--> Association 