DEF_LOOKUP "VN540" PROCESS_BASE PROCESS_MARKS ALL DIRECTION LTR
IN_CONTEXT
 LEFT GROUP "VN540GLYPHS"
END_CONTEXT
AS_SUBSTITUTION
SUB GLYPH "uni0F71"
WITH GLYPH "uni0F71.altN540"
END_SUB
SUB GLYPH "uni0F74"
WITH GLYPH "uni0F74.altN552"
END_SUB
SUB GLYPH "uni0F75"
WITH GLYPH "uni0F75.altN540"
END_SUB
END_SUBSTITUTION