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Specification tree
generic data specification
   
parameter
   elem

   using nat

   data types tree := leaf
                   | branch(. .left : tree;. .val : elem;. .right : tree)
                   ;

   variables  t : tree;
              t0 : tree;
              t1 : tree;
              left : tree;
              val : elem;
              right : tree;

   size functions  # . : tree → nat;

   
end generic data specification