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Proof step 3 from proof junkref-update (
previous step
)
⊦ ¬ junkref(str, r, st) ∧ ¬ _type ∈ fis ∧ ¬ path∃(str, r, r0, st) → ¬ path∃(str, r, r0, update(r0, fis, st))
Lemma
nopathex-update