bootstrap-3-3-3-3.html.twig in Bootstrap Layouts 8.3

<div {{ attributes.addClass('row') }} >
  {{ title_suffix.contextual_links }}
  {% if content.far_left %}
  <div class="col-sm-3">
    {{ content.far_left }}
  </div>
  {% endif %}
  {% if content.mid_left %}
  <div class="col-sm-3">
    {{ content.mid_left }}
  </div>
  {% endif %}

  {% if content.mid_right %}
  <div class="col-sm-3">
    {{ content.mid_right }}
  </div>
  {% endif %}

  {% if content.far_right %}
  <div class="col-sm-3">
    {{ content.far_right }}
  </div>
  {% endif %}
</div>