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Specification ops
enrich separation with
   procedures 
      alloc   : ref × heap nonfunctional nondeterministic;
      read  ref × heap : obj;
      write  ref × obj : heap nonfunctional;
      free  ref : heap nonfunctional;
   
   axioms 
      read-known : (r => o0 * P)(H) ⊦ ⟪read(r, H; o1)⟫ o0 = o1;
      read-unknown : (r =>_ * P)(H) ⊦ ⟪read(r, H; o)⟫ true;
      write-known : (r => o0 * P)(H) ⊦ ⟪write(r, o1; H)⟫ (r => o1 * P)(H);
      write-unknown : (r =>_ * P)(H) ⊦ ⟪write(r, o; H)⟫ (r => o * P)(H);
      alloc : P(H) ⊦ ⟪alloc(; r, H)⟫ (r =>_ * P)(H);
      free-unknown : (r =>_ * P)(H) ⊦ ⟪free(r; H)⟫ P(H);
      free-known : (r => o * P)(H) ⊦ ⟪free(r; H)⟫ P(H);
end enrich