I'm probably answering my own question but:
if i have ligatures for 'a_m' and 'c_a' and i write the word 'came' how it does it work exactly.
if my coding goes
sub am by a_m;
sub ca by c_a;
then i'm assuming it would use the a_m ligature.
I'm creating a ligature rich font and was wondering if people know of any problems with having a lot ligatures.