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    my $data = "1ABCD2EFGH3IJKL4MNOP5QRST6UVWX";
    my $entry_size = 5;
...
    my $a_size = $entry_size - 1;
    my @out = unpack "(CA$a_size)*", $data;
    push @out, [ splice @out, 0, 2 ] for 1 .. @out / 2;

($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,