Sentence is related to Care. Care is related to Others. 
Population is a type of Collection. Population is related to Measurement. Measurement is related to Yard. Yard is related to Meter. 
Sentence <--RelatedTo--> Care <--RelatedTo--> Others 
Collection <--IsA-- Population <--RelatedTo--> Measurement <--RelatedTo--> Yard <--RelatedTo--> Meter 