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#!/usr/bin/env perl

...
      print $fh $out;
    }
}

                  Rate   kcott_by_line append_per_line    kcott_concat
kcott_by_line    716/s              --            -20%            -93%
append_per_line  900/s             26%              --            -91%
kcott_concat    9690/s           1254%            976%              --