The order of the substution rules does matter, and you need to define the longest substitutions first.
sub i l' l' by l_l;
The Dutch /ij is not a ligature, it is a digraph which means that it is just a combination of two seperate letters.Bhikkhu Pesala said:In Dutch, a word like fijn (nice) should not use an fi ligature. It is the ij that are the ligature. My fij Standard ligature fixes that problem.