Past is a type of History. Past is similar to Ancient. 
Artificial is related to Doll. Doll is related to Believe. Believe is related to God. God is related to Heaven. 
History <--IsA-- Past <--SimilarTo--> Ancient 
Artificial <--RelatedTo--> Doll <--RelatedTo--> Believe <--RelatedTo--> God <--RelatedTo--> Heaven 