The evidence of the use of the Sanskrit language in Indic writing systems appears in southeast Asia in the first half of the 1st millennium CE. A few of these in Vietnam are bilingual where both the Sanskrit and the local language is written in the Indian alphabet. Early Sanskrit language inscriptions in Indic writing systems are dated to the 4th century in Malaysia, 5th to 6th centuries in Thailand near Si Thep and the Sak River, early 5th century in Kutai (east Borneo) and mid-5th century in west Java (Indonesia). Both major writing systems for Sanskrit, the North Indian and South Indian scripts, have been discovered in southeast Asia, but the Southern variety with its rounded shapes are far more common. The Indic scripts, particularly the Pallava script prototype, spread and ultimately evolved into Mon-Burmese, Khmer, Thai, Laos, Sumatran, Celebes, Javanese and Balinese scripts. From about the 5th century, Sanskrit inscriptions become common in many parts of South Asia and Southeast Asia, with significant discoveries in Nepal, Vietnam and Cambodia.