Template:Multiple substs

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{{subst:subst}}#ifexpr:{{{2}}}>0|{{subst:subst}}multiple substs|{{{1}}}a| Expression error: Unrecognised punctuation character "{"}} {{subst:subst}}multiple substs|{{{1}}}b|Expression error: Unrecognised punctuation character "{"}}|{{{1}}}}}

Substituting this template produces one or more new substitution template calls, allowing recursive change of a page, see Help:Recursive conversion of wikitext.