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  1. or download this
    #!/usr/bin/perl
use strict;
...
    eol    => "\n",
    filter => {1 => sub { length },
               5 => sub { length }});
  2. or download this
    1,2,3,4,5,6
keep,keep,keep,keep,keep,keep
...
delete,delete,delete,delete,,delete
keep,2,3,4,keep,6
,delete,delete,delete,,delete
  3. or download this
    ($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,