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Proof step 4 from proof bar-eq-sub (conclusion)

i0 ≤ i, i + j ≤ i0 + j0 ⊦ getbytearray(r, (* i0), (* j0), st) = getbytearray(r0, (* i0), (* j0), st0) → (getbytearray(r, i, j, st) ≠ getbytearray(r0, i, j, st0) ↔ false)

Special step normalize

And obtained the following new goals

Proof step 3:
i0 ≤ i, i + j ≤ i0 + j0 ⊦ getbytearray(r, i0, j0, st) = getbytearray(r0, i0, j0, st0) → (getbytearray(r, i, j, st) ≠ getbytearray(r0, i, j, st0) ↔ false)