Wall is related to Vertical. Vertical is related to Post. Post is a synonym of Carry. 
Species is related to Human. Human is related to Personality. Identity is a type of Personality. 
Wall <--RelatedTo--> Vertical <--RelatedTo--> Post <--Synonym--> Carry 
Species <--RelatedTo--> Human <--RelatedTo--> Personality <--IsA-- Identity 