Sheet is related to Book. Secret is a type of Book. Voting can be Secret. Voting is related to Ballot. 
Democratic is similar to Republican. Republican is derived from Republic. Republic is related to Retail. 
Sheet <--RelatedTo--> Book <--IsA-- Secret <--HasProperty-- Voting <--RelatedTo--> Ballot 
Democratic <--SimilarTo--> Republican --DerivedFrom--> Republic <--RelatedTo--> Retail 