site/_includes/head.html

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<meta name="description" content="{% if page.summary %}{{ page.summary | strip_html | strip_newlines | truncate: 160 }}{% endif %}">
<meta name="keywords" content="{{page.tags}}{% if page.tags %}, {% endif %} {{page.keywords}}">
<title>{% if page.homepage == true %} {{site.homepage_title}} {% elsif page.title %}{{ page.title }}{% endif %}  | {{ site.site_title }}</title>
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