Bicycle is a type of Toy. Person wants (to) Bicycle. Person does not want (to) Pregnant. 
Invent is related to Develop. Elaborate is a type of Develop. Elaborate is the opposite of Plain. 
Toy <--IsA-- Bicycle <--Desires-- Person --NotDesires--> Pregnant 
Invent <--RelatedTo--> Develop <--IsA-- Elaborate <--Antonym--> Plain 