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When I follow this procedure, and I view my attempt in "Preview", it displays errors such as:
Expression error: Unrecognized punctuation character "[".
Is this a problem with preview, or something else? I did not use any brackets. --Bejnar (talk) 22:38, 9 June 2013 (UTC)
I've just figured that one out myself, major thanks to Nilfanion, after several days of racking my brains. Turns out you get the error when previewing, but it's fine when saved. BigSteve (talk) 13:43, 22 October 2013 (UTC)