Passage: Old Akkadian, which was used until the end of the 3rd millennium BC, differs from both Babylonian and Assyrian, and was displaced by these dialects. By the 21st century BC Babylonian and Assyrian, which were to become the primary dialects, were easily distinguishable. Old Babylonian, along with the closely related dialect Mariotic, is clearly more innovative than the Old Assyrian dialect and the more distantly related Eblaite language. For this reason, forms like lu-prus ('I will decide') are first encountered in Old Babylonian instead of the older la-prus. While generally more archaic, Assyrian developed certain innovations as well, such as the "Assyrian vowel harmony". Eblaite is even more so, retaining a productive dual and a relative pronoun declined in case, number and gender. Both of these had already disappeared in Old Akkadian. Over 20,000 cuneiform tablets in Old Akkadian have been recovered from the Kültepe site in Anatolia. Most of the archaeological evidence is typical of Anatolia rather than of Assyria, but the use both of cuneiform and the dialect is the best indication of Assyrian presence.Old Babylonian was the language of king Hammurabi and his code, which is one of the oldest collections of laws in the world. (see Code of Ur-Nammu.) The Middle Babylonian (or Assyrian) period started in the 16th century BC. The division is marked by the Kassite invasion of Babylonia around 1550 BC. The Kassites, who reigned for 300 years, gave up their own language in favor of Akkadian, but they had little influence on the language. At its apogee, Middle Babylonian was the written language of diplomacy of the entire Ancient Near East, including Egypt. During this period, a large number of loan words were included in the language from Northwest Semitic languages and Hurrian; however, the use of these words was confined to the fringes of the Akkadian-speaking territory.

Question: What Old Babylonian language help was eventually established?
Assyrian vowel harmony