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Proof step 7 from proof onlymod-is-update (
previous step
)
⊦ validFields(r, (sk × val) ' + fis, st) ↔ validFields(r, fis, st) ∧ sk ≠ _length ∧ sk ≠ _type ∧ r -- sk ∈ st ∧ ¬ sk ∈ fis
Lemma
validFields-rec