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      30.4.5.8 The list_drop() Function
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  <p>
   Removes a value from a comma-separated list of values and
          returns the result. For more information, see the description
          of
   <a class="link" href="sys-list-add.html" title="30.4.5.7 The list_add() Function">
    <code class="literal">
     list_add()
    </code>
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       Parameters
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      <p>
       <code class="literal">
        in_list TEXT
       </code>
       : The list to be
                modified.
      </p>
     </li>
     <li class="listitem">
      <p>
       <code class="literal">
        in_drop_value TEXT
       </code>
       : The value to drop
                from the list.
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     </li>
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       Return Value
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   <p>
    A
    <code class="literal">
     TEXT
    </code>
    value.
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