day there is no single official orthography for Nahuatl. Apart from dialectal differences, major issues in transcribing Nahuatl include: whether to follow Spanish orthographic practice and write with c and qu, with cu and uc, with c and z, or s, and with hu and uh, or u. how to write the saltillo phoneme (in some dialects pronounced as a glottal stop and in others as an ), which has been spelled with j, h, ꞌ (apostrophe), or a grave accent on the preceding vowel, but which traditionally has often been omitted in writing. whether and how to represent vowel length, e.g. by double vowels or by the use of macrons. In 2018, Nahua peoples from 16 states in the country began collaborating with INALI creating a new modern orthography called Yankwiktlahkwilolli, designed to be the standardized orthography of Nahuatl in the coming years. The modern writing has much greater use in the modern variants than in the classic variant, since the texts, documents and literary works of the time usually use the Jesuit one. Literature Among the indigenous languages of the Americas, the extensive corpus of surviving literature in Nahuatl dating as far back as the 16th century may be considered unique. Nahuatl literature encompasses a diverse array of genres and styles, the documents themselves composed under many different circumstances. Preconquest Nahua had a distinction between 'speech' and second 'song', akin to the distinction between "prose" and "poetry". Nahuatl prose has been preserved in different forms. Annals and chronicles recount history, normally written from the perspective of a particular altepetl (locally based polity) and often combining mythical accounts with real events. Important works in this genre include those from Chalco written by Chimalpahin, from Tlaxcala by Diego Muñoz Camargo, from Mexico-Tenochtitlan by Fernando Alvarado Tezozomoc and those of Texcoco by Fernando Alva Ixtlilxochitl. Many annals recount history year-by-year and are normally written by anonymous authors. These works are sometimes evidently based on pre-Columbian pictorial year counts that existed, such as the Cuauhtitlan annals and the Anales de Tlatelolco. Purely mythological narratives are also found, like the "Legend of the Five Suns", the Aztec creation myth recounted in Codex Chimalpopoca. One of the most important works of prose written in Nahuatl is the twelve-volume compilation generally known as the Florentine Codex, authored in the mid-16th century by the Franciscan missionary Bernardino de Sahagún and a number of Nahua speakers. With