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$query = new WP_Query(array(
  'post_type' => 'post',
));
$posts_per_row = 2;
$post_counter = 0;
if( have_posts() ) :
  while( $query->have_posts() ) : 
    $query->the_post();
    if( ( ++$post_counter % $posts_per_row ) == 1  || $posts_per_row == 1 ) :
      if( $post_counter > 1 ) :
        echo '</div>';
      endif;
      echo '<div class="row">';
    endif;
    ?>
    <div>
      <p>Your content</p>
    </div>
    <?php endwhile; ?>
  </div>
<?php
endif; 
wp_reset_postdata();