Nuclear is similar to Central. Central is related to City. City is related to Traffic. 
Peanut is a type of Plant. Peanut is related to Jar. you are likely to find Candy in/at/on Jar. 
Nuclear <--SimilarTo--> Central <--RelatedTo--> City <--RelatedTo--> Traffic 
Plant <--IsA-- Peanut <--RelatedTo--> Jar <--AtLocation-- Candy 