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Proof step 183 from proof inv-io-save (previous step)

¬ n ∈ istore ⊦ refsize-cons(istore, as) ∧ as | n = ∅ → refsize-cons(istore[n, indexblock(ind ', @(m0, m1) ', m1)], as ++ @(n, m0, m1))

A spec-lemma