Array.prototype.uniq = function () {
  for (var i = 0, r = [], s = []; i < this.length; i++) {
    for (var j = 0; j < s.length; j ++) 
      if (s[j] === this[i]) break;
    if (j == s.length) {
      r.push(this[i]);
      s.push(this[i]);
    }
  }
  return r;
};