static public function decode($number)
    {
        $k = self::$encoder;
        preg_match_all('/[1][a-zA-Z]|[2-9]|[a-zA-Z]|[0]/', $number, $a);
        $n = '';
        $o = count($k);
        foreach ($a[0] as $i) {
            $f = preg_match('/1([a-zA-Z])/', $i, $v);
            if ($f == true) {
                $i = $o + array_search($v[1], $k);
            } else {
                $i = array_search($i, $k);
            }
            $n .= $i;
        }
        return $n;
    }