Definition codeSysPrfNot :=
existH 2
(andH (substituteFormula LNN codeSysPrf 0 (var 2))
(substituteFormula LNN
(substituteFormula LNN (primRecFormula 1 (proj1_sig codeNotIsPR)) 0
(var 2)) 1 (var 0))).

Lemma freeVarCodeSysPrfN :
forall v : nat, In v (freeVarFormula LNN codeSysPrfNot) -> v <= 1.