Case is a synonym of Instance. Instance is related to One. 
Constraint is a type of Restriction. Constraint is the opposite of Freedom. Freedom is a type of Belief. Thought is a type of Belief. 
Case <--Synonym--> Instance <--RelatedTo--> One 
Restriction <--IsA-- Constraint <--Antonym--> Freedom --IsA--> Belief <--IsA-- Thought 