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   A CategoryMatrixObject	    references a set of CategoryMatrixEntry	    objects for its entries. 
   Ends 
   categoryMatrix 
   The CategoryMatrixObject	    references a set of CategoryMatrixEntry. class: CategoryMatrixObject	    multiplicity: exactly one aggregation:
            composite 
   entry 
   A CategoryMatrixEntry	    is referenced by CategoryMatrixObject	    as its entry. class: CategoryMatrixEntry	    multiplicity: zero or
            more