Explanation:

The importance of contacts of the Punjab with the world is best reflected in the scripts which became current during this period. Yuan Chwang refers to the alphabet of India and its several branches. He appears to refer to the Brahmiscript and its regional variations. This Brahmi script was introduced in the Punjab by the Mauryan emperor Ashoka through his inscriptions. However, he used two other scripts for his inscriptions in the north-west: Greek and Kharoshthi. The latter remained in use till about the end of the third century AD. The discovery of Buddhist scrolls from Gandhara, dating to about the first century AD, reveals the use of Kharoshthi script for purposes other than administrative. Incidentally, it also
reveals that the Prakrit of the north-west of the Punjab was different from both Pali and the hybrid Sanskrit used for the Buddhist texts of northern India.The Kharosthi script was used on the north-western frontier province(Punjab) since then uptil about 4th century AD.