Design is related to Master. Master is similar to Principal. Principal is similar to Interest. Interest is a type of Fee. 
Current is related to Liquid. Acid is a type of Liquid. Acid is a type of Chemical. Carrier is a type of Chemical. 
Design <--RelatedTo--> Master <--SimilarTo--> Principal <--SimilarTo--> Interest --IsA--> Fee 
Current <--RelatedTo--> Liquid <--IsA-- Acid --IsA--> Chemical <--IsA-- Carrier 