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<? while ( have_posts() ) : the_post(); ?>
    <? if ( have_rows( 'flexible_content' ) ) : ?>
        <? while ( have_rows( 'flexible_content' ) ) : the_row(); ?>
            <? $layout = get_flexible_content_template_uri( get_row_layout() ); ?>
            <? if ( file_exists( $layout ) ) include $layout; ?>
        <? endwhile; ?>
    <? endif; ?>
<? endwhile; ?>