Type is related to Unit. Combination is a type of Unit. Combination is the opposite of Separation. 
Graduation is related to Passing. Passing is related to Die. Die is a type of Change. 
Type <--RelatedTo--> Unit <--IsA-- Combination <--Antonym--> Separation 
Graduation <--RelatedTo--> Passing <--RelatedTo--> Die --IsA--> Change 