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Proof step 4 from proof range-extend (
previous step
)
⊦ range=(ar0, n0, ar1, n1, m0 + m1) ↔ range=(ar0, n0, ar1, n1, m0) ∧ range=(ar0, n0 + m0, ar1, n1 + m0, m1)
Lemma
range-eq-append