From: gneuner2@comcast.net   
      
   On Sat, 9 Mar 2019 10:14:01 +0100, Hans-Peter Diettrich   
    wrote:   
      
   >IMO bottom-up parsers (LR) do pattern matching, in contrast to top-down   
   >parsers (LL). Where bottom-up parsers can suffer from shift/reduce   
   >conflicts.   
      
   And top-down parsers suffer from common prefixes and backtracking.   
      
   George   
      
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