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Proof step 22 from proof mod-square-10 (previous step)

prime(5), 4 * i0 * i0 = j * 10, 5 | 4 ∨ 5 | i0 * i0 ⊦ (2 * i0) % 10 = 0

Heuristic simplifier applied rule simplifier

And obtained the following new goals

Rule argument

Additional information

Used simplifier rules: prime-5: ⊦ prime(5);%div-not-ls: ⊦ i < j ∧ 0 < i → ¬ j | i;