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Specification tree
data specification
   using nat
   data types 
      Tree[A] := leaf
              | branch(. left : Tree[A];. val : A;. right : Tree[A])
              ;
   
   variables 
       t : Tree[A];
       t0 : Tree[A];
       t1 : Tree[A];
       left : Tree[A];
       val : A;
       right : Tree[A];
   
   size functions 
       # . : Tree[A] → Nat;
   
   
end data specification