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<?php
$args = array('post_type' => 'avis');
$the_query = new WP_Query( $args );

if ( $the_query->have_posts() ) {

	while ( $the_query->have_posts() ) {
		$the_query->the_post();
	}
	/* Restore original Post Data */
	wp_reset_postdata();
} else {
	// no posts found
}
?>