#!/usr/bin/perl
open (X,$0);X([<X>]);sub X{$x=shift;print pack("C*",
map{s|X|**|g;s|x|*|g;eval;}(split(/\|/,join("",
map{s|\#||;eval}(grep/x/,(grep/^\#/,@$x))))));}
#$x="2x37|13x3X2|23x5|29x2X2|2X5|5x13|5x2x11|3x37|29x2X2|13x2X3|101|19x3x2";
#$x="|2X5|2X4x5|101|19x3x2|3X3x2X2|2X5|2X3x3X2|97|3X2x11|107|101|19x3x2";

##</code><code>##

use CGI qw(param); 

my %hash= map{my $v=[param($_)];$_,$#$v>0?join
             ("\0",@$v):shift@$v}param();


##</code><code>##

my $x=50; #blocksize
foreach (my $i=0;$i<=int($#ary/50);$i++) 
{
    my $end = ($x*$i+$x-1>=$#ary?$#ary:($x*$i+$x-1);
    my @keep = @ary[$i*$x..$end]; 
    # Do stuff with @keep
}

##</code><code>##

my @sorted;
my @array=(0..10);

@first = splice (@array, 0, int(($#array+2)/2));

@sorted=map{(shift @first, shift @array)}(0..$#array);
push (@sorted, shift @first) if ++$#first;