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Specification suffix
enrich gearray with
   functions 
      suffix : array × nat → array;
   predicates 
       . < . : array × array;
   
   axioms 
      suffix : n ≤ # ar ⊦ suffix(ar, n) = subarray(ar, n, # ar - n);
      used for : ls;
       
      lexicographic
      : ⊦ 
          ar0 < ar1
        ↔ (∃ n. 
            n ≤ # ar0 ∧ n ≤ # ar1 ∧ subarray(ar0, 0, n) = subarray(ar1, 0, n) ∧ (# ar0 = n → # ar1 > n) ∧ (# ar0 ≠ n → # ar1 ≠ n ∧ ar0[n] < ar1[n]));
      used for : ls;
       
end enrich