Doll is related to American. American is related to Congress. Congress is related to Legislation. Legislation is a type of Government. 
Helmet is related to Protection. Protection is related to Shade. 
Doll <--RelatedTo--> American <--RelatedTo--> Congress <--RelatedTo--> Legislation --IsA--> Government 
Helmet <--RelatedTo--> Protection <--RelatedTo--> Shade 