Since this isn't fates exclusive (it supports FE4, FE13, and FE14) I thought posting here is more appropriate than in the Fates subforum.
ANYWAY I'll just paste what I have from my Tumblr post:
FIRE EMBLEM PAIRINGS OPTIMIZER
tumblr post here
tl;dr have a weekend project because some nerd (cough) wanted to implement some search algos with FE and this happened praise github
I'm thinking of adding randomized pairings and customized sets at some point