Languages of the European Union languages, Latvian and Lithuanian; the Celtic languages, including Irish; and Greek are also Indo-European. Outside the Indo-European family, Estonian, Finnish, and Hungarian are Uralic languages while Maltese is the only Afroasiatic language with official status in the EU. The Basque language, a language isolate whose roots are unknown, is an official language in some parts of northern Spain, but not an official language of the EU. Most official EU languages are written in the Latin script. The two exceptions are Greek, which is written in the Greek script, and Bulgarian, which is written in Cyrillic script. With the accession of
Uralic–Yukaghir languages World's Languages" by Merritt Ruhlen (1987). Uralic and Yukaghir are listed as a language family, forming a subgroup of a higher-order family called "Eurasiatic", in Joseph Greenberg's "Indo-European and Its Closest Relatives" (2000–2002). However, Greenberg did not present a discursive argument for this subgroup, presumably leaving it to the reader to work it out from the data on grammar and vocabulary he presented. The Uralic–Yukaghir family has been accepted by the American Nostraticist Allan Bomhard (2008:176, citing Ruhlen 1987:64–65) but without presenting any argument for it, and Russian linguist Vladimir Napolskikh. Collinder summarizes his case for, not merely a relationship