Se fareblus oni, jam farintus oni. (It definitely won't happen on an echo-change day like today, either. ;))
Contra my comrade's comment, Esperanto orthography is firmly European, and so retains European-style casing distinctions; every sound thus still has two letters -- or at least two codepoints.
(There aren't any eszettesque bigraphs, but that's not saying much.)
It is probably time for an Esperanto advocate to show up and set us all straight.