Showing Posts Between a Range

I am trying to display 6 posts over two columns. In column one, I am wanting to display the first 3, which I have managed. However, I now want to display posts 4, 5 & 6 in the second column. I am not sure what the argument is for this part is.

    <div class="container">
  <div class="row">
    <div class="col-md-6 col-xs-12">
      <div class="recentposts_simple">
        {{- range ( where site.RegularPages "Section" "blog" | first 3 ) }}
        <h4>
          {{ .Title }}
        </h4>
        <p>{{ .Summary }} <a href="#">Read More »</a>
        </p>

        {{ end}}
      </div>
    </div>

    <div class="col-md-6 col-xs-12">
      <div class="recentposts_simple">
        {{- range ( where site.RegularPages "Section" "blog" | first 3 ) }}
        <h4>
          {{ .Title }}
        </h4>
        <p>{{ .Summary }} <a href="#">Read More »</a>
        </p>

        {{ end}}
      </div>
    </div>
  </div>
</div>

Any help would be appreciated. Thanks.

Thanks. I did see that, but I am confused about how to add it into the line below

{{- range ( where site.RegularPages "Section" "blog" | first 3 ) }}

Or modify this one to account for blog posts only
{{ range first 3 (after 1 .Pages.ByPublishDate.Reverse) }}

If you want posts 4,5,6, you should probably use

range first 3 (after 3...)

Thanks for the tips folks. I found the solution eventually after rearranging the range line to this:

{{ range first 3 (after 3 ( where site.RegularPages "Section" "blog")) }}

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