L. L. Zamenhof, the creator of Esperanto, proposed the so-called "h-system" ("h-sistemo" in Esperanto). Instead of diacritics, the letter "h" is added, with the only exception being "ŭ". For example, "ĝ" becomes "gh", "ĥ" becomes "hh" and "ŭ" becomes "u". Words which appear to have a diacritic but do not actually can be "broken" with a hyphen or an apostrophe. For example, "flughaveno" (airport) becomes "flug-haveno" or "flug'haveno".