Slope is related to Math. Math is related to Equal. Equal is the opposite of Unfair. 
Headquarters is related to Capital. Capital is related to Town. Downtown is derived from Town. Downtown is related to Business. 
Slope <--RelatedTo--> Math <--RelatedTo--> Equal <--Antonym--> Unfair 
Headquarters <--RelatedTo--> Capital <--RelatedTo--> Town <--DerivedFrom-- Downtown <--RelatedTo--> Business 