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Proof step 1 from proof datasize-subarray-h (conclusion)

⊦ m0 + m1 = # buf ∧ m ≤ m1 → datasize(subarray(buf, m0, m1), m) = (datasize(buf, m0 + m) ≤ m0 ⊃ 0;datasize(buf, m0 + m) - m0)

System applied rule normalize

And obtained the following new goals

Rule argument

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