srecord noeq LexicographicIterator(S alphabet) extends ItIt<S> {
  new IntBuffer l;
  
  *(S *alphabet, int minLength) {
    repeat minLength { l.add(0); }
  }
  
  public bool hasNext() {
    ret true; // haha!
  }
  
  public S next() {
    S s = makeString();
    int i = 0;
    while (i < l(l)) {
      int n = l.get(i);
      if (n+1 < l(alphabet)) {
        l.set(i, n+1);
        break;
      }
      l.set(i++, 0);
    }
    if (i >= l(l)) l.add(0);
    ret s;
  }
  
  S makeString() {
    int n = l(l);
    char[] chars = new[n];
    for i to n:
      chars[i] = alphabet.charAt(l.get(i));
    ret str(chars);
  }
}