It uses letters associated with Spanish, such as . The , devised in 2004 by the Sociedat de Lingüistica Aragonesa (SLA), is used by some Aragonese writers. It uses etymological forms which are closer to Catalan, Occitan, and medieval Aragonese sources; trying to come closer to the original Aragonese and the other Occitano-Romance languages. In the SLA system , ,, , and before and are distinct, and the digraph replaces . During the 16th century, Aragonese Moriscos wrote aljamiado texts (Romance texts in Arabic script), possibly because of their inability to write in Arabic. The language in these texts has a mixture of Aragonese and Castilian traits, and they are among the last known written examples of the Aragonese formerly spoken in central and southern Aragon. Grammar Aragonese grammar has a lot in common with Occitan and Catalan, but also Spanish. Articles The definite article in Aragonese has undergone dialect-related changes, with definite articles in Old Aragonese similar to their present Spanish equivalents. There are two main forms: These forms are used in the eastern and some central dialects. These forms are used in the western and some central dialects. Lexicology Neighboring Romance languages have influenced Aragonese. Catalan and Occitan influenced Aragonese for many years. Since the 15th century, Spanish has most influenced Aragonese; it was adopted throughout Aragon as the first language, limiting Aragonese to the northern region surrounding the Pyrenees. French has also influenced Aragonese; Italian loanwords have entered through other languages (such as Catalan), and Portuguese words have entered through Spanish. Germanic words came with the conquest of the region by Germanic peoples during the fifth century, and English has introduced a number of new words into the language. Gender Words that were part of the Latin second declension—as well as words that joined it later on—are usually masculine: > ('son') + > ('squirrel') Words that were part of the Latin first declension are usually feminine: > ('daughter'). Some Latin neuter plural nouns joined the first declension as singular feminine nouns: > ('leaf'). Words ending in -or are feminine: , , , and (in Medieval Aragonese) The names of fruit trees usually end in -era (a suffix derived from Latin -aria) and are usually feminine: a perera, a manzanera, a nuquera, , / , a olivera, a ciresera, l'almendrera The genders of river names vary: Many ending in -a are feminine: /, , , , , ,