Darkness is related to Evil. Evil is related to Sin. Sin is related to Pride. Pride is related to Being. 
Division is related to Procedure. Calculation is a type of Procedure. Calculation is a synonym of Estimate. 
Darkness <--RelatedTo--> Evil <--RelatedTo--> Sin <--RelatedTo--> Pride <--RelatedTo--> Being 
Division <--RelatedTo--> Procedure <--IsA-- Calculation <--Synonym--> Estimate 