Exhibition is related to Statue. Statue is related to Law. Law is related to Tax. Tax is related to Proposal. 
Letter is related to One. One is a synonym of Right. Right is related to Current. Current is the opposite of Old. 
Exhibition <--RelatedTo--> Statue <--RelatedTo--> Law <--RelatedTo--> Tax <--RelatedTo--> Proposal 
Letter <--RelatedTo--> One <--Synonym--> Right <--RelatedTo--> Current <--Antonym--> Old 