I would like to note that zi'o cannot be used in place of tu'oi because
that means that there is a version of the sentence in which the terbri is
deleted such that the result is intended, or one is forming a set which has
zi'o (the meaning, not the quoted word) as an element, which is
essentially meaningless as far as I can tell. In any case, zi'o either
directly fills or is an element of a set which fills a terbri; it is not
modifying the connective, but instead the selbri.