> mu'i le nu le'i se kecti pinfu
> for the poor prisoners
I would say {lei} or {le} instead of {le'i}, since mathematical
sets can't really be free or not free.
That may be enough, but if you want to be more literal
maybe something like {cu co'a zifre gau} to indicate that
they are set free and not just that they start to be free.