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In this case you hadnone, so I've put one in; maybe that will work.There should be exactly one # between &'s, when an\halign or \valign is being set up. In this case you hadmore than one, so I'm ignoring all but the first.You have given more \span or & marks than there werein the preamble to the \halign or \valign now in progress.So I'll assume that you meant to type \cr instead.The `$' that I just saw supposedly matches a previous `$$'.So I shall assume that you typed `$$' both times. 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