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   A CategoryMatrix	    references a set of Category	    as index labels of the matrix . 
   Ends 
   categoryMatrix 
   The CategoryMatrix	    references a non-empty set of Category	    for matrix index labels. class: CategoryMatrix	    multiplicity: zero
            or more 
   category 
   A non-empty set of Category	    is referenced by CategoryMatrix	    as its index labels. class: Category	    multiplicity: two or more