Cart is related to Horse. Horse is related to Large. Large is related to Wall. 
Slave is a different concept from Independent. Independent is related to Candidate. Candidate is related to Democrat. Democrat is a type of Advocate. 
Cart <--RelatedTo--> Horse <--RelatedTo--> Large <--RelatedTo--> Wall 
Slave <--DistinctFrom--> Independent <--RelatedTo--> Candidate <--RelatedTo--> Democrat --IsA--> Advocate 