xkcd {{{1}}}
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Set the first (and only) parameter to the number of whatever xkcd comic you want to link to. For example, {{xkcd|285}} (xkcd 285) creates a link to "Wikipedian protester", and {{xkcd|978}} (xkcd 978) to "Citogenesis".
{{xkcd|285}}
{{xkcd|978}}