>
      <a href="{{ '/bayes' | relative_url }}" class="btn{% if page.name == 'bayes.md' %} active{% endif %}">Bayes</a>
      <a href="{{ '/lsi' | relative_url }}" class="btn{% if page.name == 'lsi.md' %} active{% endif %}">LSI</a>
      <a href="{{ '/validation' | relative_url }}" class="btn{% if page.name == 'validation.md' %} active{% endif %}">Validation</a>
      <a href="{{ '/development' | relative_url }}" class="btn{% if page.name == 'development.md' %} active{% endif %}">Development</a>
      <a hr