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      <header alignment="Center" color="#a9a9a9">&amp;[DATE] &amp;[TIME] - &amp;[FILENAME]</header>
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            <p>Method 1</p>
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          <p>-------------------------------------------------</p>
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            <p>Method 2</p>
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          <e type="operand">14.5</e>
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          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
          <e type="operand">x</e>
          <e type="operand">1</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">y</e>
          <e type="operand">1</e>
          <e type="operator" args="2">≡</e>
          <e type="operand">2</e>
          <e type="operand">1</e>
          <e type="function" args="4">mat</e>
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        <content>
          <p>-------------------------------------------------</p>
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          <e type="operand">x</e>
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          <e type="operand">y</e>
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            <p>x and y should be undefined</p>
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          <e type="operand">x</e>
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          <e type="function" args="2">Clear</e>
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          <p>-------------------------------------------------</p>
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            <p></p>
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          <e type="operand">y</e>
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          <e type="operand">x</e>
          <e type="operand">y</e>
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          <e type="operand">y</e>
          <e type="operand">2993</e>
          <e type="operand">x</e>
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          <e type="operand">14.5</e>
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          <e type="bracket">(</e>
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          <e type="operand">2</e>
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            <p>Method 3</p>
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          <e type="operand">2</e>
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