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Interprets the input as wikitext using the frame:preprocess function. Any arguments passed to {{Expand wikitext}} are available in the preprocessed code, letting this be used as a rudimentary way of using variables.
If the entire input is in a nowiki tag, or if the optional parameter |unstrip=yes is specified, first extracts the contents of nowiki tags before preprocessing.
Example
{{Expand wikitext|{{Make code|<<As of!2015!02>>}}}}→ As of February 2015[update]<table>{{Expand wikitext|<nowiki>{{Episode list/sublist | 1 = One Piece (season 15) | EpisodeNumber = {{{ep}}} | Title = An Explosive Situation! Luffy vs. Fake Luffy! | OriginalAirDate = {{Date|2011-10-02 +{{#expr:({{{ep}}})-517}} weeks }} }} </nowiki>|ep=518}}</table>→
{{Expand wikitext|<nowiki>{{2x|x}}-</nowiki>}}→ {{2x|x}}-{{Expand wikitext|<nowiki>{{2x|x}} -</nowiki>}}→ xx -{{Expand wikitext|<nowiki><u>u</u><ref>text</ref></nowiki>}}→ <u>u</u><ref>text</ref>