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function test_links__system_main_menu($variables)
{

    $html = "<div>";
    $html .= "  <ul>";
    foreach ($variables['links'] as $link) {
        $html .= "<li class='test'>" . l($link['title'], $link['path'], $link) . "</li>";
    }
    $html .= "  </ul>";
    $html .= "</div>";

    return $html;
}