Theme is etymologically related to Do. Do is the opposite of Act. Act is derived from Action. 
Description is a type of Statement. Statement is related to Agree. Conclude is a type of Agree. 
Theme --EtymologicallyRelatedTo--> Do <--Antonym--> Act --DerivedFrom--> Action 
Description --IsA--> Statement <--RelatedTo--> Agree <--IsA-- Conclude 