Wave is related to Sin. Sin is the opposite of Virtue. Charity is a type of Virtue. 
Sandwich is related to Roll. Roll is related to Paint. Paint is related to Artistic. Artistic is related to Poet. 
Wave <--RelatedTo--> Sin <--Antonym--> Virtue <--IsA-- Charity 
Sandwich <--RelatedTo--> Roll <--RelatedTo--> Paint <--RelatedTo--> Artistic <--RelatedTo--> Poet 