These should be broken down by region as well, no?
No. Same as usaus isn't broken up into 49 separate systems
alus, arus, azus, caus, cous, ctus, dcus,
deus, flus, gaus, iaus, idus, ilus, inus,
ksus, kyus, laus, maus, mdus, meus, mius,
mnus, mous, msus, mtus, ncus, ndus, neus,
nhus, njus, nmus, nvus, nyus, ohus, okus,
orus, paus, rius, scus, sdus, tnus, txus,
utus, vaus, vtus, waus, wius, wvus, wyus
but kept as a whole. Ditto usai and 52 systems, eure and 80 systems, etc, etc