which uses reduplication in Tocharian A (possibly from the reduplicated aorist) but long PIE ē in Tocharian B (possibly related to the long-vowel perfect found in Latin lēgī, fēcī, etc.). Tocharian B shows an internal chronological development; three linguistic stages have been detected. The oldest stage is attested only in Kucha. There are also the middle ("classical") and the late stage. Tocharian C A third Tocharian language was first suggested by Thomas Burrow in the 1930s, while discussing 3rd-century documents from Krörän (Loulan) and Niya. The texts were written in Gandhari Prakrit, but contained loanwords of evidently Tocharian origin, such as kilme ("district"), ṣoṣthaṃga ("tax collector"), and ṣilpoga ("document"). This hypothetical language later became generally known as Tocharian C; it has also sometimes been called Kroränian or Krorainic. In papers published posthumously in 2018, Klaus T. Schmidt, a scholar of Tocharian, presented a decipherment of 10 texts written in the Kharoṣṭhī script. Schmidt claimed that these texts were written in a third Tocharian language he called . He also suggested that the language was closer to Tocharian B than to Tocharian A. In 2019 a group of linguists led by Georges Pinault and Michaël Peyrot convened in Leiden to examine Schmidt's translations against the original texts. They concluded that Schmidt's decipherment was fundamentally flawed, that there was no reason to associate the texts with Krörän, and that the language they recorded was neither Tocharian nor Indic, but Iranian. Phonology Phonetically, Tocharian languages are "centum" Indo-European languages, meaning that they merge the palatovelar consonants of Proto-Indo-European with the plain velars (*k, *g, *gʰ) rather than palatalizing them to affricates or sibilants. Centum languages are mostly found in western and southern Europe (Greek, Italic, Celtic, Germanic). In that sense Tocharian (to some extent like the Greek and the Anatolian languages) seems to have been an isolate in the "satem" (i.e. palatovelar to sibilant) phonetic regions of Indo-European-speaking populations. The discovery of Tocharian contributed to doubts that Proto-Indo-European had originally split into western and eastern branches; today, the centum–satem division is not seen as a real familial division. Vowels Tocharian A and Tocharian B have the same set of vowels, but they often do not correspond to each other. For example, the sound a did not occur in Proto-Tocharian. Tocharian B a is derived from former stressed ä or unstressed ā (reflected unchanged in Tocharian A), while Tocharian A a stems from Proto-Tocharian