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        <a class="toc_link" href="page1.xml">The Drilling Problem</a>
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        <a class="toc_link" href="">Foundations</a>
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        <a class="toc_link" href="page5.xml">What is a Graph?</a>
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        <a class="toc_link" href="page7.xml">Edges and Vertices</a>
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        <a class="toc_link" href="page10.xml">A First Theorem</a>
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        <a class="toc_link" href="page12.xml">Types of Graphs</a>
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        <a class="toc_link" href="page15.xml">Subgraphs and Supergraphs</a>
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        <a class="toc_link" href="page18.xml">Walks, Paths, Cycles</a>
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        <a class="toc_link" href="page21.xml">Trees</a>
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        <a class="toc_link" href="">Solving the Drilling Problem</a>
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        <a class="toc_link" href="page24.xml">Independent Sets, Cliques, etc.</a>
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        <a class="toc_link" href="page26.xml">Vertex Coloring</a>
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        <a class="toc_link" href="page28.xml">Modeling it as a Graph Theory Problem</a>
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        <a class="toc_link" href="page31.xml">First Lower Bound</a>
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        <a class="toc_link" href="page33.xml">The Inside View</a>
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        <a class="toc_link" href="page34.xml">A Good Coloring</a>
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        <a class="toc_link" href="page37.xml">The Best Coloring</a>
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      <h1>Problem List</h1>
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      <h2>What is a Graph?</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page6.{$extension}#problem1">1</a> | <a href="&#10;&#9;&#9;&#9;&#9;page6.{$extension}#problem2">2</a></p>
      <h2>Edges and Vertices</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page8.{$extension}#problem3">3</a> | <a href="&#10;&#9;&#9;&#9;&#9;page9.{$extension}#problem4">4</a></p>
      <h2>A First Theorem</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page10.{$extension}#problem5">5</a> | <a href="&#10;&#9;&#9;&#9;&#9;page10.{$extension}#problem6">6</a> | <a href="&#10;&#9;&#9;&#9;&#9;page11.{$extension}#problem7">7</a></p>
      <h2>Types of Graphs</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page13.{$extension}#problem8">8</a> | <a href="&#10;&#9;&#9;&#9;&#9;page13.{$extension}#problem9">9</a> | <a href="&#10;&#9;&#9;&#9;&#9;page14.{$extension}#problem10">10</a> | <a href="&#10;&#9;&#9;&#9;&#9;page14.{$extension}#problem11">11</a></p>
      <h2>Subgraphs and Supergraphs</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page16.{$extension}#problem12">12</a> | <a href="&#10;&#9;&#9;&#9;&#9;page16.{$extension}#problem13">13</a> | <a href="&#10;&#9;&#9;&#9;&#9;page17.{$extension}#problem14">14</a></p>
      <h2>Walks, Paths, Cycles</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page19.{$extension}#problem15">15</a> | <a href="&#10;&#9;&#9;&#9;&#9;page19.{$extension}#problem16">16</a> | <a href="&#10;&#9;&#9;&#9;&#9;page19.{$extension}#problem17">17</a> | <a href="&#10;&#9;&#9;&#9;&#9;page20.{$extension}#problem18">18</a></p>
      <h2>Trees</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page22.{$extension}#problem19">19</a> | <a href="&#10;&#9;&#9;&#9;&#9;page23.{$extension}#problem20">20</a> | <a href="&#10;&#9;&#9;&#9;&#9;page23.{$extension}#problem21">21</a></p>
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      <h2>Independent Sets, Cliques, etc.</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page25.{$extension}#problem22">22</a> | <a href="&#10;&#9;&#9;&#9;&#9;page25.{$extension}#problem23">23</a> | <a href="&#10;&#9;&#9;&#9;&#9;page25.{$extension}#problem24">24</a></p>
      <h2>Vertex Coloring</h2>
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        <a href="&#10;&#9;&#9;&#9;&#9;page27.{$extension}#problem25">25</a>
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      <h2>Modeling it as a Graph Theory Problem</h2>
      <p><a href="&#10;&#9;&#9;&#9;&#9;page29.{$extension}#problem26">26</a> | <a href="&#10;&#9;&#9;&#9;&#9;page29.{$extension}#problem27">27</a> | <a href="&#10;&#9;&#9;&#9;&#9;page29.{$extension}#problem28">28</a> | <a href="&#10;&#9;&#9;&#9;&#9;page30.{$extension}#problem29">29</a> | <a href="&#10;&#9;&#9;&#9;&#9;page30.{$extension}#problem30">30</a></p>
      <h2>First Lower Bound</h2>
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        <a href="&#10;&#9;&#9;&#9;&#9;page32.{$extension}#problem31">31</a>
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      <h2>A Good Coloring</h2>
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        <a href="&#10;&#9;&#9;&#9;&#9;page36.{$extension}#problem32">32</a>
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