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Proof step 34 from proof pathex-put-cyclic (previous step)

⊦ validrefs(str, refs + r0 ', ty, st) ∧ ¬ r ∈ refs ∧ fs ' ≠ _type ∧ fs ' ≠ _length ∧ oktype(val, fs .type, st) → validrefs(str, refs + r0 ', ty, st[r -- fs ', val])

Lemma validrefs-put-notin-02