Hi all: After compared the output, I find if virama following ra, the ligature not formed, ex:(ha,virama,ra,virama), the first virama should be moved after ra and the sequence should become (ha,ra,virama,virama), then vattu formed by (ra,virama), then (ha, vattu) should form ligature, then the last virama applied to the ligature. See attachment to find difference.
હ્ર્ ha,virama,ra,virama પ્ર્ pa,virama,ra,virama ધ્ર્ dha,virama,ra,virama Br,Dean
<<attachment: gu.png>>
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