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From: Saašha Metsärantala
> In this case, one may wonder how we should interpret the following
> production in today's BNF:
> 
> lastTwoDigits = digit digit | digit "u" | "u" "u"


I've changed it to 

lastTwoDigits = 
         digit digit 
       | digit "u" 
       | "u" "u"