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…in reply to @PixelAmbacht
PixelAmbacht Not as is. The only way I know how to do it is by adding another temporary glyph, like "foo.scrap" to the font. Then this works: lookup foo { sub b c d e by foo.scrap; } foo; feature ss01 { lookup foo; sub a foo.scrap by f; sub z foo.scrap by f; } ss01;