In 1632, Dahai added diacritical marks to clear up a lot of the ambiguity present in the original Mongolian script; for instance, a leading "k", "g", and "h" are distinguished by the placement of no diacritical mark, a dot, and a circle, respectively. This revision created the standard script, known as () — the "script with dots and circles". As a result, the Manchu alphabet contains little ambiguity. Recently discovered manuscripts from the 1620s make clear, however, that the addition of dots and circles to Manchu script began before their supposed introduction by Dahai.