DEF_LOOKUP "VN180" PROCESS_BASE PROCESS_MARKS ALL DIRECTION LTR
IN_CONTEXT
 LEFT GROUP "VN180GLYPHS"
END_CONTEXT
AS_SUBSTITUTION
SUB GLYPH "uni0F71"
WITH GLYPH "uni0F71.altN180"
END_SUB
SUB GLYPH "uni0F74"
WITH GLYPH "uni0F74.altN192"
END_SUB
SUB GLYPH "uni0F75"
WITH GLYPH "uni0F75.altN180"
END_SUB
END_SUBSTITUTION