I am looking for conditional ligature feature only in certain condition? Currently, if I do standard ligature, it will always apply to two or more glyphs whenever it see them. Once it becomes ligature, I can't do other substitutions on lig. glyphs. So I want ligature applied to certain conditions and not always. Or can dlig ( example: t s --> t_s ) be called within calt when they follow certain @LETTERS
??? Any advice on this???