Learning can be used for Survival. Learning is related to Science. Science is related to History. 
Doctor is a type of Play. Doctor is related to Examination. Survey is a type of Examination. Overlook is a type of Survey. 
Survival <--UsedFor-- Learning <--RelatedTo--> Science <--RelatedTo--> History 
Play <--IsA-- Doctor <--RelatedTo--> Examination <--IsA-- Survey <--IsA-- Overlook 