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The transitive closure can also be used to determine which supertype concept or concepts are essential to the definition of a concept. These concepts are known as the the 

1. Use the transitive closure table to get the set of all concepts that are supertypes of concept A
   • Call this set: Set-B
2. Create a subset of Set-B containing only those concepts with definitionsStatusIddefinitionStatusId=900000000000074008|primitive| 
   
   • Call this set: Set-C

3. Create a subset of Set-C containing only those concepts that have no subtypes that are also in Set

   C 

   -C

   Footnote Macro
   Concepts in Set-C that also have subtypes in Set-C are primitive supertypes of concept A but they are not proximal primitive supertypes because these subtype(s) are are more specific concepts that are also primitive supertypes of concept A.

   • The resulting set represents the primitive supertypes of Concept-concept A.

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