<?php
$tt = microtime(true);
for($j=0;$j<10;$j++){
    $mom = true;
    while($mom){
    $a = array();
    for($i=0;$i <= 9;$i++)
        $a[] = rand(5,7);
        if(@($a[0] + 13 * $a[1] / $a[2] + $a[3] + 12 * $a[4] - $a[5] - 11 + $a[6] * $a[7] / $a[8] - 10 ) == 66){
            if(isset($argv[1]) &&  $argv[1] == 'debug'){
                echo $a[0]." + 13 * ".$a[1]." / ". $a[2]." + ".$a[3]." + 12 * ".$a[4]." - ".$a[5]." - 11 + ".$a[6]." * ".$a[7]." / ".$a[8]." - 10 ";
                echo "== 66\n";
            }
            $mom = false;
        }
    }
}
$tt2 = microtime(true);
echo "\n $tt2 - $tt =  ".($tt2-$tt)."\n";