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Proof step 20 from proof square-inject (previous step)

(i0 + j0) * (i0 + j0 + 1) = i1 * 2, (i + j) * (i + j + 1) = i1 * 2 + j0 * 2 - j * 2, j ≤ i1 + j0, 0 ≤ i1 + j0, 0 ≤ i, 0 ≤ j, 0 ≤ i0, 0 ≤ j0, 0 ≤ i1 ⊦ i = i0 ∧ j = j0

User applied rule insert equation

And obtained the following new goals

Rule argument

pos: left 1 flags: rotate, discard

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