Adenan Satem, a Taib loyalist, became the new publicity chief. Both languages show no satem-like assibilation in spite of being located in the satem area. There is debate on whether the Illyrian language was a centum or a satem language. Renfrew argues that the centum/satem classification is irrelevant in determining relationships between languages. For example, the labiovelars merged with the plain velars as in other satem languages. But lack of evidence prevents any firm centum/satem classification for these ancient languages. As with most synthetic "satem" languages double negative is mandatory in Latvian and Lithuanian. The delabialisation in the satem languages would have occurred later, in a separate stage. Sanskrit belongs to the satem group of the Indo-European languages. Russian, as a Slavic language, belongs to the Satem group. In 2015, Chief Minister Adenan Satem reinstated English as an official language. Within the Indo-European family, Indo-Iranian belongs to the Satem group. Indo-European people, rather than satem Baltic-speakers. There are two main groups of the Indo-Europeans languages; Centum and Satem. In satem languages, they remained distinct, and the labiovelars merged with the plain velars.