Esperanto alphabet
Another system used to replace diacritics is the x-system (x-sistemo in Esperanto). The letter x is not used in the Esperanto alphabet, but it can be used to write diacritics. The x-system, unlike the h-system, does not treat ŭ differently from the other letters. For example, ĝ becomes gx, ĥ becomes hx and ŭ becomes ux. flughaveno remains the same, as there is no ambiguity.