Final Fantasy Tactics Advance Linking

Does anyone know how to unlock all of the link missions? Whenever I link up with my friends, we only have the option of four missions, and I read somewhere that there’s atleast 6.

*edit: well, looks like I didn’t look hard enough, I found this: http://faqs.ign.com/articles/446/446321p1.html
Thanks for all the help people. :stuck_out_tongue: