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             s/iter   original late_chomp  rand_seek
original       4.83         --        -9%      -100%
late_chomp     4.39        10%         --      -100%
rand_seek  1.20e-03    402667%    365992%         --

# assumes a global "$n" and "$file"
sub rand_seek {
...
    }
    close $fh
}