How does the Japanese language do dual quantification?


According to the evolution of the English language, certain quantifiers (both,
either, neither, each I think this is exhaustive) are remnant of the older
dual number.

However, Japanese, if I recall _her_ linguistic evolution correctly, never had
a dual number. So how do Japanese language speakers quantify over dual
elements? That is, what is the idiomatic Japanese version of usage of both,
either, neither, and each?

