System is related to Religion. Religion is related to Heaven. Heaven is related to Hot. Hot is related to Shade. 
Constitution is related to Historic. Historic is a synonym of Historical. Historical is similar to Real. Real is related to Estate. 
System <--RelatedTo--> Religion <--RelatedTo--> Heaven <--RelatedTo--> Hot <--RelatedTo--> Shade 
Constitution <--RelatedTo--> Historic <--Synonym--> Historical <--SimilarTo--> Real <--RelatedTo--> Estate 