vertices that can be reached in a straight line. (Do not forget the
    neighbors on the same polygon.) Use the straight-line distance for
    the heuristic function.<br />

4.  Apply one or more of the algorithms in this chapter to solve a range
    of problems in the domain, and comment on their performance.<br />
</div>

  </div>
  <div class="card">
    <div class="card-header p-2">
        <a href='#' class="p-2">Exercise 3.9</a>
        <a class="bookmarkquest" id="bookmark_question">
          <butto