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Proof step 7 from proof leone-two (previous step)

j0 < 2, 0 ≤ j0, 0 ≤ i0 ⊦ i0 ≤ 1 ↔ i0 * 2 + j0 ≤ 3

User applied rule case distinction

And obtained the following new goals

Proof step 8:
i0 ≤ 1, j0 < 2, 0 ≤ j0, 0 ≤ i0 ⊦ i0 * 2 + j0 ≤ 3
Proof step 11:
i0 * 2 + j0 ≤ 3, j0 < 2, 0 ≤ j0, 0 ≤ i0 ⊦ i0 ≤ 1

Rule argument

pos: right 1

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