System is related to Just. Just is the opposite of Unfair. Unfair is the opposite of Equal. 
Range is related to Song. Song is related to Musical. Musical is related to Scale. Scale is related to Rate. 
System <--RelatedTo--> Just <--Antonym--> Unfair <--Antonym--> Equal 
Range <--RelatedTo--> Song <--RelatedTo--> Musical <--RelatedTo--> Scale <--RelatedTo--> Rate 