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Proof step 13 from proof nopathex-update (
previous step
)
⊦ ¬ path∃(str, r, r0, st) ∧ ¬ junkref(str, r, st) ∧ sk ≠ _type → ¬ path∃(str, r, r0, st[r0 -- sk, val])
Lemma
pathex-put-last