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  56 <h5 class="subsubsection">3.1.3.2 Point and vector literals</h5>
  57
  58 <p><a name="index-point-literal-175"></a><a name="index-literal_002c-point-176"></a><a name="index-vector-literal-177"></a><a name="index-literal_002c-vector-178"></a>Points and vector literals have these forms respectively.
  59 <pre class="example">     (<i>X</i>,<i>Y</i>,<i>Z</i>)  [<i>X</i>,<i>Y</i>,<i>Z</i>]
  60 </pre>
  61    <p class="noindent">Each of the components is itself a scalar expression.  The
  62 z-components are optional and default to zero.
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