<script type="text/javascript"> function myfind(has, other, n) {    if (n == 0) {        document.write(has.join(","));        document.write("<br/>");        return;    }         if (other.length < n) {        return;    }         var one = other.shift();    if (isIn(has, one)) {        myfind(has, other, n);    } else {        var newhas = has.concat();        var newother = other.concat();                 has.push(one);        myfind(has, other, n-1);        myfind(newhas, newother, n);    }}function isIn(has, one) {    for (i in has) {        if (has[i].substring(0, 3) == one.substring(0, 3)) {            return true;        }    }    return false;} var a="777 3,777 0,888 1,999 3,765 3,765 2,771 3,798 1";myfind(new Array(), a.split(","), 6); </script>