anchor.diff:  
          PrefixCharClasses:TFLREPrefixCharClasses;
          CountPrefixCharClasses:longint;
  -       CountObviousPrefixCharClasses:longint;
  +       AveragePrefixCharClassesVariance:longint;
          PrefixPatternBitMasks:TFLRECharPatternBitMasks;
   
          ByteMap:TFLREByteMap;
  
positive.code:    end;
    end;
   end;
  var ThreadIndex,Count,Index:longint;
      CurrentThreadList,NewThreadList,TemporaryThreadList:PThreadList;
      CurrentThread:PThread;
      Instruction:PFLREInstruction;
  
negative.code:     end;
     end;
  
     TotalCount:=0;
     for CurrentPosition:=0 to CountPrefixCharClasses-1 do begin
      Count:=0;
      for CurrentChar:=#0 to #255 do begin
  