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All the Perl that's Practical to Extract and Report

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  • Read the description of grep carefully, and note what it says about aliasing. (Yeah, I know you're using map, and the POD for map doesn't say anything about aliasing (at least not in 5.8), but map and grep behave behave the same in this regard.)
    • Uh, never mind. The issue really is with sort, and the lack of info in perlfunc on sort's aliasing behavior.