Economist is a type of Newspaper. Onion is a type of Newspaper. 
Help is related to Need. Need is related to Lock. Lock is related to Combination. Combination is the opposite of Separation. 
Economist --IsA--> Newspaper <--IsA-- Onion 
Help <--RelatedTo--> Need <--RelatedTo--> Lock <--RelatedTo--> Combination <--Antonym--> Separation 