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Proof step 9 from proof prime-317 (previous step)

10 ≤ i, i < 20 ⊦ i = 10 ∨ i = 11 ∨ i = 12 ∨ i = 13 ∨ i = 14 ∨ i = 15 ∨ i = 16 ∨ i = 17 ∨ i = 18 ∨ i = 19

Lemma case-20