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    <title>Road slope X</title>
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    <h1>
      What is the meaning of X% ?
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	  alt="Traffic sign for danger from high road slope. " />
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		<mfrac>
		  <mn>2 &#x3B1;</mn>
		  <mi>&#x3C0;</mi>
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	      <math mode="display" xmlns="http://www.w3.org/1998/Math/MathML">
		<mfrac>
		  <mn>v</mn>
		  <mi>h</mi>
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		<mfrac>
		  <mn>v</mn>
		  <mi>d</mi>
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