{% set other_episodes = [] %}

{% for episode in all_episodes %}
  {% if episode.guests|first is same as(guest) and episode.topic is not same as(topic) %}
    {% set other_episodes = other_episodes|merge([episode]) %}
  {% endif %}
{% endfor %}

{% if other_episodes is not empty %}
  <section>
    <h2>Other episodes with {{ guest }}</h2>

    <ul>
      {% for episode in other_episodes %}
        <li>
          <a href="{{ episode.url|trim('/', 'right') }}">{{ episode.topic }}</a>
          - {{ episode.date|date('jS F Y') }}
        </li>
      {% endfor %}
    </ul>
  </section>
{% endif %}