Does these slices make sense to you?

/dev/twed0s1d on /mnt/root (ufs, local, soft-updates)  will be /
/dev/twed0s1e on /mnt/tmp (ufs, local, soft-updates)   will be /tmp
/dev/twed0s1f on /mnt/var (ufs, local, soft-updates)   will be /var
/dev/twed0s1g on /tmp/usr (ufs, local, soft-updates)   will be /usr


I'm used to / being s1a