ly well, but cannot guarantee that the best solution
      has been found.  It is very common for algorithms to get
      stuck at a solution which is merely a "local minimum".
      For such a local minimum, every slight rearrangement of
      the solution makes the energy go up; however a major
      rearrangement would result in a big drop in energy.
    </p>

    <p>
      A simple algorithm for the problem is known as "H-Means".
      It alternates between two procedures:
      <ul>
        <li>
      