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<?php
  switch_to_blog(1);
$blog = new WP_Query(array(
  'post_type' => 'post', 
  'posts_per_page' => 4, // all posts
  ) 
); 
?>
<ul>
<?php while ( $posts->have_posts() ) : $posts->the_post(); ?>
  <li><?php get_template_part('loop') ?></li>
<?php 
endwhile; 
wp_reset_postdata(); 
?> 
</ul>
<?php 

  restore_current_blog(); //switched back to current site 
?>