I would never have thought to look at it in those terms.

I'm not sure what terms you have picked. You didn't really describe what you wanted done. "I want this from that" requires guesswork to understand. Specifically, it doesn't answer what's special about the lines you want to keep. If you come up with a different answer to that question, you'll probably get a different program that gets the same result.

In reply to Re^3: Data manipulation confusion by ikegami
in thread Data manipulation confusion by hudsterboy

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