canonical-Tag for forumdisplay

[Majora]

Hey all,
the canonical-tag for forumhome is <link rel="canonical" href="{vb:raw vboptions.bburl}" />
for showthread: <link rel="canonical" href="{vb:raw thread_url}" />

but what is the canonical-Tag for forumdisplay?

Best regards
Matthias

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Anyone?