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  • You’ve missed the fact that the pattern occurs many times.   If “The mail system” appears on lines 4, 14, 24, 34, …, the OP wants to see lines 6, 16, 26, 36, …   Your answer will give 6, 14-16, 24-26, 34-36, …. Commented Aug 21, 2020 at 5:41