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{{- $page := .page -}}
{{- $mode := .mode -}}
{{- $pages := where $page.CurrentSection.RegularPages.ByWeight "Params.series" $page.Params.series -}}
{{- $currentIndex := -1 -}}
{{- range $index, $candidate := $pages -}}
{{- if eq $candidate.RelPermalink $page.RelPermalink -}}
{{- $currentIndex = $index -}}
{{- end -}}
{{- end -}}
{{- if ge $currentIndex 0 -}}
{{- $position := add $currentIndex 1 -}}
{{- if eq $mode "position" }}
<p class="series-position"><a href="{{ $page.CurrentSection.RelPermalink }}">{{ $page.CurrentSection.LinkTitle }}</a> <span aria-hidden="true">·</span> {{ printf "%02d/%d" $position (len $pages) }}</p>
{{- else if eq $mode "navigation" }}
<nav class="document-navigation series-navigation" aria-label="{{ $page.CurrentSection.LinkTitle }} chapters">
<ul>
<li class="series-previous"{{ if eq $currentIndex 0 }} aria-hidden="true"{{ end }}>
{{- if gt $currentIndex 0 }}
{{- $previous := index $pages (sub $currentIndex 1) }}
<span class="navigation-label">previous</span>
<a rel="prev" href="{{ $previous.RelPermalink }}">← {{ printf "%02d. %s" (sub $position 1) $previous.LinkTitle }}</a>
{{- end }}
</li>
<li class="series-index-link"><a href="{{ $page.CurrentSection.RelPermalink }}">↑ {{ $page.CurrentSection.LinkTitle }}</a></li>
<li class="series-next"{{ if eq $position (len $pages) }} aria-hidden="true"{{ end }}>
{{- if lt $position (len $pages) }}
{{- $next := index $pages $position }}
<span class="navigation-label">next</span>
<a rel="next" href="{{ $next.RelPermalink }}">{{ printf "%02d. %s" (add $position 1) $next.LinkTitle }} →</a>
{{- end }}
</li>
</ul>
</nav>
{{- end -}}
{{- end -}}
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