1lookup GSUB5f1 { 2 ignore sub three' four'; 3 ignore sub four' five'; 4} GSUB5f1; 5 6lookup GSUB5f2 { 7 ignore sub [a - z]' [A - H]' [I - Z]'; 8 ignore sub [a - z]' [A - H]' [I - Z]'; 9 ignore sub [a - z]' [I - Z]' [A - H]'; 10} GSUB5f2; 11 12lookup GSUB5f3 { 13 ignore sub e'; 14} GSUB5f3; 15 16feature test { 17 lookup GSUB5f1; 18 lookup GSUB5f2; 19 lookup GSUB5f3; 20} test; 21