<nav>
  <div class="separator orange"></div>
  <ul>
  <div id="logo">
  <a href="/" alt="Advanced Computational Electromagnetics (ACEM) Research Group">ACEM Research</a>
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  <div id="navItems">
  {%- for item in site.data.navigation -%}
  {%- assign slashArr = page.url | split: "/" -%}
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  {%- assign mainSubdir = slashArr[1] | strip -%}
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  {%- endfor -%}
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</nav>