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     {% set entries = craft.entries
    .section('articles')
    .with([
        'featureImage',
        'postCategories'
    ])
    .featured('feature')
    .all() %}
      <div class="columns">
{% for entry in entries|slice(0, 1) %}
 {% if entry.id not in existingIds %}
  <div class="column is-12">
{% include '_blocks/big/entries.twig'  %}
</div>
{% set existingIds = existingIds|merge([entry.id]) %}
    {% endif %}
{% endfor %}
</div>

  <div class="columns">
{% for entry in entries|slice(1,2) %}
 {% if entry.id not in existingIds %}
  <div class="column is-6">
{% include '_blocks/medium/entries.twig'  %}
</div>
{% set existingIds = existingIds|merge([entry.id]) %}
    {% endif %}
{% endfor %}
</div>