Lakarra, Joseba A. (2017). "Prehistoria de la lengua vasca". In Gorrochategui Iván Igartua, Joaquín; Igartua, Iván; Lakarra, Joseba A. (eds.). Historia de la lengua vasca [History of the Basque language] (in Spanish). Vitoria-Gasteiz: Gobierno Vasco. Retrieved 4 November 2019.
The first telegraph message in Basque was sent by Teodoro de Arana y Beláustegui, at the time a deputy to the Cortes from Gipuzkoa, to Ondarroa; it read: Aitorreu hizcuntz ederrean nere lagun eta erritarrai bistz barrengo eroipenac (transl. heartfelt regards to my friends and compatriots in the wonderful language of Aitor), Diario de Reus 26.06.04
Basque's two rhotics only contrast when between vowels, where the trill is written as -rr- and the tap as -r-. When a suffix is added to a word ending in -r, a trill is generally used, as in ederrago 'more beautiful', from eder 'beautiful' and -ago. There is a small number of words which are exceptions to this rule, with de Rijk listing the following ten common ones: zer, ezer, nor, inor, hor, paper, plater, plazer, ur, and zur.[61]