Quiz time -- "euronum" edit

[Kenneth Brody]

Quiz time!  (I hope everyone studied.)

I recently posted the following edit:

    euronum   \ N N N euron2 | N N euron2 | N euron2
    euron2    [{ <.> N N N }] ( <,00> @ | "," NUM NUM )

This takes numbers and puts them in the European style, where digits
are separated by periods and the decimal is a comma.  For example:

    123.456.789,01

My questions to you are:

    Why wouldn't the following, simpler, edit work?

        euronum   \ N N N euron2 | N N euron2 | N euron2
        euron2    [{ <.> N N N }] <,> NUM NUM

    And, how does the "corrected" version above fix the problem?

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