<article>
  <front>
    <article-meta>
      <title-group>
        <article-title>!</article-title>
      </title-group>
      <contrib-group>
        <contrib contrib-type="author">
          <name>
            <surname>!</surname>
          </name>
        </contrib>
      </contrib-group>
      <abstract>
        <p>!</p>
      </abstract>
    </article-meta>
  </front>
  <article-body>
    <p>X<sup>2</sup><sup>
        <xref rid="ref-1" ref-type="bibr">1</xref>
      </sup></p>
    <p>OneToThree<sup>
        <xref rid="ref-1" ref-type="bibr">1</xref>,
        <xref rid="ref-himmelstein_open_2019" ref-type="bibr">2</xref>,
        <xref rid="ref-hartl_essential_2006" ref-type="bibr">3</xref>
      </sup></p>
    <p><b>Two<sup>
        <xref rid="ref-himmelstein_open_2019" ref-type="bibr">2</xref>
      </sup></b></p>
    <section>
      <h2>OneThree<sup>
          <xref rid="ref-1" ref-type="bibr">1</xref>,
          <xref rid="ref-hartl_essential_2006" ref-type="bibr">3</xref>
        </sup></h2>
    </section>
  </article-body>
  <back>
    <ref-list>
      <ref id="ref-1">
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          <article-title>Open collaborative writing with Manubot</article-title>
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            <day>06</day>
          </date-in-citation>
          <volume>15</volume>
          <issue>6</issue>
          <fpage>e1007128</fpage>
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      <ref id="ref-hartl_essential_2006">
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</article>
