gistfile1.txt

        if( have_rows('tt_front_page_image_calls_to_action_right_column_images') ):
          $count = 1;
          
          if ( $count % 6 == 1 ) {
            $value = "myClass";
          } else if ( $count % 6 == 4 ) {
            $value = "myClass";
          } else {
            $value = '';
          }
          while ( have_rows('tt_front_page_image_calls_to_action_right_column_images') ) : the_row();
            echo "<div class='col-md-4 col-sm-12 " . $value . "'>";
              echo "<img class='tt-explore-section-trailers-image' src='" . get_sub_field('tt_front_page_image_calls_to_action_right_column_images_image') . "' />";
            echo "</div>";
            $count++;
          endwhile;
        endif;