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Proof step 104 from proof Lagrange-SumOf4Squares-primes (previous step)

odd(j0), abs(i3) ≤ j0 / 2, abs(i4) ≤ j0 / 2, abs(i5) ≤ j0 / 2, abs(i6) ≤ j0 / 2, 0 < j0, j0 ≠ 1, 0 < i3 ^2 + i4 ^2 + i5 ^2 + i6 ^2 ⊦ i3 ^2 + i4 ^2 + i5 ^2 + i6 ^2 < j0 ^2

Lemma four-square-odd-ls