Falk sees the basic writing system of Brahmi as being derived from the Kharoṣṭhī script, itself a derivative of Aramaic. At the time of his writing, the Ashoka edicts were the oldest confidently dateable examples of Brahmi, and he perceives in them "a clear development in language from a faulty linguistic style to a well honed one"[10] over time, which he takes to indicate that the script had been recently developed.[9][1] Falk deviates from the mainstream of opinion in seeing Greek as also being a significant source for Brahmi.