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Specification subst
enrich context with
comment: there is no harm done, to define substitution on all raw contexts.;
   functions 
      . [ . ] : rawctxt × term → term;
   
   axioms 
      subst-O :  ⊦ O[t] = t;
      used for : s, ls;
       
      subst-Cfun :  ⊦ (C _ t1)[t] = C[t] _ t1;
      used for : s, ls;
       
      subst-Carg :  ⊦ (t1 _ C)[t] = t1 _ C[t];
      used for : s, ls;
       
end enrich