1# OpenType Feature File specification, section 5.f.ii, example 3 2# "Specifying exceptions to the Chain Sub rule" 3# http://www.adobe.com/devnet/opentype/afdko/topic_feature_file_syntax.html 4 5feature test { 6 @LETTER = [a - z]; 7 ignore sub @LETTER a' n' d', a' n' d' @LETTER; 8 sub a' n' d' by a_n_d; 9} test; 10