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{% set langobj = grav['language'] %}
{% for key in langswitcher.languages %}
{% if key == langswitcher.current %}
	{% set lang_url = page.url %}
{% else %}
	{% set lang_url = base_url_simple ~ langobj.getLanguageURLPrefix(key) ~ langswitcher.page_route ~ page.urlExtension ?: '/' %}
{% endif %}
<link rel="alternate" hreflang="{{ key }}" href="{{ lang_url ~ uri.params }}" />
{% endfor %}