lookup GSUB6f1 {
    ignore sub one two three' four' five six seven;
    ignore sub two one three' four' six five seven;
} GSUB6f1;

lookup GSUB6f2 {
    ignore sub [A - H] [I - Z] [a - z]' [A - H]' [I - Z]';
    ignore sub [I - Z] [A - H] [a - z]' [A - H]' [I - Z]';
    ignore sub [A - H] [I - Z] [a - z]' [I - Z]' [A - H]';
} GSUB6f2;

lookup GSUB6f3 {
    ignore sub [space comma semicolon] e';
} GSUB6f3;

feature test {
    lookup GSUB6f1;
    lookup GSUB6f2;
    lookup GSUB6f3;
} test;