{% assign id = "/licenses/" | append: include.license-id %}
{% assign licenses = site.licenses | where:"id", id %}
{% for license in licenses %}
  {% assign using = license.using %}
  {% if using.size > 0 %}
    {% for used in using limit: 3 %}
      {% assign last = forloop.last %}
      {% if last and using.size > 1 %}
        and
      {% endif %}
      {% for hash in used %}
        <a href="{{ hash[1] }}">{{ hash[0] }}</a>{% if last == false %},{% endif %}
      {% endfor %}
    {% endfor %}
    use the {% if license.nickname %}{{ license.nickname }}{% else %}{{ license.title }}{% endif %}.
  {% endif %}
{% endfor %}

{% assign id = "/licenses/" | append: include.license-id %}
{% assign licenses = site.licenses | where:"id", id %}
{% for license in licenses %}
  {% assign using = license.using %}
  {% if using.size > 0 %}
    {% for used in using limit: 3 %}
      {% assign last = forloop.last %}
      {% if last and using.size > 1 %}
        and
      {% endif %}
      {% for hash in used %}
        <a href="{{ hash[1] }}">{{ hash[0] }}</a>{% if last == false %},{% endif %}
      {% endfor %}
    {% endfor %}
    use{% if using.size == 1 %}s{% endif %} the {% if license.nickname %}{{ license.nickname }}{% else %}{{ license.title }}{% endif %}.
  {% endif %}
{% endfor %}

Add 's' when only a single license
Add 's' when only a single license

When `using.size` == 1, add an 's' to the using sentence.