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If ∠1 ≅ ∠8 and ∠2 ≅ ∠7, then l₁ || l₂.

Two parallel lines l1 and l2 intersected by a transversal t, forming angles 1, 2, 7, and 8, with the condition that angle 1 equals angle 8 and angle 2 equals angle 7, indicating the lines are parallel.

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