{%- macro valid_virt_cluster() -%}

  {%- import_yaml "valid_custom_grains.yaml" as valid_custom_grains -%}

  {%- set valid_virt_cluster = [] -%}

  {%- for country, data in valid_custom_grains['localized'].items() -%}

    {%- if data['virt_cluster'] is iterable and data['virt_cluster'] is not string -%}

      {%- for item in data['virt_cluster'] -%}

        {%- do valid_virt_cluster.append(item) -%}

      {%- endfor -%}

    {%- else -%}

      {%- do valid_virt_cluster.append(data['virt_cluster']) -%}

    {%- endif -%}

  {%- endfor -%}

  {{ valid_virt_cluster }}

{%- endmacro -%}