[MediaWiki-l] Transcluding a template at most once?

Is there a way to construct a template that appears on a page only once, even if it's transcluded multiple times?

For example, if the template "T" contains the word "foo", then:

{{T}} {{T}} {{T}} {{T}}

would display as "foo", not "foo foo foo foo".

My use case is that "T" contains a navigation menu. I want to make sure it never appears more than once on any page.

Thanks, DanB

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