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          <h2 id="format-age-categories">Format age categories <a href="#format-age-categories" class="anchor" aria-hidden="true"></a></h2>
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          <p><code><a href="age_categories.html">age_categories()</a></code> <code><a href="age_categories.html">group_age_categories()</a></code> </p>
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        <td><p>Create an 