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Proof step 12 from proof prime-1259 (previous step)

20 ≤ i, i < 30 ⊦ i = 20 ∨ i = 21 ∨ i = 22 ∨ i = 23 ∨ i = 24 ∨ i = 25 ∨ i = 26 ∨ i = 27 ∨ i = 28 ∨ i = 29

Lemma case-30