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Theorem pathex-put-nopathex

⊦ ¬ path∃(str, r, r0, st) ∧ ¬ junkref(str, r, st) ∧ sk ≠ _type → (path∃(str, r, r1, st[r0 -- sk, val]) ↔ path∃(str, r, r1, st))

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