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File:	Presentation/GeneralLayout/mfrac/mfracAkeyword9
CVS-ID:
Author:	Robert Miner and Jeff Schaefer, Geometry Technologies
Description:	This example tests the linethickness attribute with keyword values.
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Source Code:

<math xmlns="http://www.w3.org/1998/Math/MathML"> 
  <mrow> 
    <mfrac linethickness="thin"> 
      <mn>1</mn> 
      <mrow> 
        <mi>y</mi> 
        <mo>+</mo> 
        <mn>3</mn> 
      </mrow> 
    </mfrac> 
    <mfrac linethickness="medium"> 
      <mn>1</mn> 
      <mrow> 
        <mi>y</mi> 
        <mo>+</mo> 
        <mn>3</mn> 
      </mrow> 
    </mfrac> 
    <mfrac linethickness="thick"> 
      <mn>1</mn> 
      <mrow> 
        <mi>y</mi> 
        <mo>+</mo> 
        <mn>3</mn> 
      </mrow> 
    </mfrac> 
  </mrow> 
</math>