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Theorem onlymod-shift

⊦ rk ∈ st → ( onlyModified(r, st[rk, val], st1) ↔ onlyModified(r, st, st1[rk, st[rk]]) ∧ rk ∈ st1 ∧ (r ≠ rk .ref ∨ rk = r -- _length ∨ rk = r -- _type → st1[rk] = val))

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