Cancer is a type of Person. Person does not want (to) Restriction. Constraint is a type of Restriction. 
Vote is related to Voter. Voter is related to Citizen. Citizen is the opposite of Foreigner. 
Cancer --IsA--> Person --NotDesires--> Restriction <--IsA-- Constraint 
Vote <--RelatedTo--> Voter <--RelatedTo--> Citizen <--Antonym--> Foreigner 