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  <?php
  $args = array(
    'post_type' => 'product',
    'posts_per_page' => 4,
    'meta_key' => 'total_sales',
    'orderby' => 'meta_value_num',
  );
  $loop = new WP_Query( $args );
  if ( $loop->have_posts() ) {
    while ( $loop->have_posts() ) : $loop->the_post();
    woocommerce_get_template_part( 'content', 'product' );
    endwhile;
  } else {
    echo __( 'No products found' );
  }
  wp_reset_postdata();
  ?>