Question: the aborignal group who traditionally lived in the area contiguaous with Coffs Harbour, New South Wales speak what language?

full_context: Document 1: Coffs Harbour: Coffs Harbour is an Australian coastal city located on the Mid North Coast of New South Wales about 540 km north of Sydney, and 390 km south of Brisbane. It is one of the largest urban centres in the North Coast region, with an estimated population of 70,000 as of June 2017.
Document 2: Kumbainggar language: Gumbaynggir language (also spelled Gumbaingari, Kumbainggar, Kumbaingeri, Gambalamam, and also called Baanbay) is an Australian Aboriginal language. It is spoken by the Gumbaynggirr, who are native to the Mid North Coast of New South Wales.
Document 3: Murri people: The Murri are the Indigenous Australians of modern-day Queensland, North West New South Wales. Collections of tribes and extended family groups throughout geographic regions of Australia have different names, such as the Yugarabul, the Jagera peoples from Coorparoo, Kwiambal peoples from Northern New South Wales and the Koori people of parts of New South Wales and Victoria. The term is their preferred term, expressing pride in their heritage and race.
Document 4: Gamilaraay: The Kamilaroi or Gamilaroi are an Indigenous Australian koori people who are from the area which extended from around Singleton in the Hunter Valley through to the Warrumbungle Mountains in the west and up through the present-day centres of Quirindi, Gunnedah, Tamworth, Narrabri, Walgett, Moree, Lightning Ridge and Mungindi in New South Wales, to Nindigully in south west Queensland. The Kamilaroi is one of the four largest indigenous nations in Australia. The Kamilaroi language is classified in the Pama–Nyungan family of Australian languages. The Kamilaroi Highway, Sydney Ferries Limited's vehicular ferry "Kamilaroi" (1901–1933), and a cultivar of Durum wheat have all been named after the Kamilaroi people.
Document 5: City of Coffs Harbour: The City of Coffs Harbour (also known as the Coffs Harbour City Council) is a local government area in the mid north coast region of New South Wales, Australia. The area under administration is 1175 km2 , expanded in 2004 to take in parts of the former Pristine Waters local government area.
Document 6: Chumburung: Chumburung is a kingdom and traditional area in the western part of Kpandae District in the Northern Region of Ghana. It is the homeland of the Chumburu, but Bassari, Gonjas, Kokombas and Nawuri(s) are also indigenous in the area. Land, however, can only be acquired with the permission of the village chief and the king, who are both natives and officials of the Chumburung kingdom. Chumburung is also the name of the language of the Chumburu.
Document 7: Wonnarua: The Wonnarua people , otherwise written "Wanarruwa" are a group of indigenous people of Australia united by a common language, strong ties of kinship and survived as skilled hunter–fisher–gatherers in family groups or clans scattered along the inland area of what is now known as the Upper Hunter Valley, New South Wales, Australia. Their creation spirit is "Baiami", also known as "Koin", the creator of all things and the "Keeper of the Valley".
Document 8: Wollongong: Wollongong ( ), informally referred to as "The Gong", is a seaside city located in the Illawarra region of New South Wales, Australia. Wollongong lies on the narrow coastal strip between the Illawarra Escarpment and the Pacific Ocean, 82 kilometres (51 miles) south of Sydney. Wollongong had an estimated urban population of 295,842 at June 2016, making it the third largest city in New South Wales after Sydney and Newcastle, and the tenth largest city in Australia.
Document 9: Urunga, New South Wales: Urunga is a small town on in the Mid North Coast region of New South Wales, Australia, in Bellingen Shire. It is famous for its surf spots (reefs, beaches and mouth of two rivers). At the 2011 census , Urunga had a population of 3,020. The town is south of Coffs Harbour and Sawtell and north of Nambucca Heads. The place name, "Urunga" (pronounced Oo-run-ga), is derived from the Gumbaynggir word "Yurūnga" (pronounced Yu-roon-ga), which is derived from the word for long "yurūn" in reference to "long white sands".
Document 10: Gumbaynggirr: Gumbaynggir (also 'Kumbainggar') are an Australian Aboriginal group who traditionally lived in the area contiguous with Coffs Harbour, New South Wales.
Document 11: Koori: The Koori People are Indigenous Australians of New South Wales and Victoria.
Document 12: Kaurna language: Kaurna ( or ) is a Pama-Nyungan language historically spoken by the Kaurna peoples of the Adelaide Plains of South Australia. The people of the Adelaide plains are known as the Kaurna people in contemporary times, but the Kaurna nation is made up of various tribal clan groups, each with their own "parnkarra" district of land, each having had their own dialectal form of language. These dialects were historically spoken in the area of the Adelaide Plains bounded by Crystal Brook and Clare in the north, Cape Jervis in the south, and just over the Mount Lofty ranges. It ceased to be spoken on an everyday basis in the 19th century, but, in a process that began in the 1990s, is being reclaimed and re-introduced.
Document 13: Bingara, New South Wales: Bingara (Aboriginal for 'creek') is a small town on the Gwydir River in Murchison County in the New England region of New South Wales, Australia. In 2011, Bingara had a population of 1,093 people. and is currently the administrative centre for the Gwydir Shire that was created in 2003. It has a culturally homogeneous population as residents are mostly of Anglo-Celtic background. Only 9.4% of the population is born overseas and 3.3% is of Aboriginal or Torres Strait Islander background. It is a popular site for retirement and hence has an old population, with 53.8% aged 55 years and over, compared to the national average of 26.4%. Bingara's socioeconomic status is comparatively lower than that of Australia. Bingara is one of the few places in Australia where diamonds have been found. The Gwydir River being a main highlight of the town is a main catchment of the Murray-Darling System.
Document 14: Bungaree: Bungaree, or Boongaree, (1775 – 24 November 1830) was an Aboriginal Australian from the Broken Bay area, who was known as an explorer, entertainer, and Aboriginal community leader.
Document 15: Yaygir people: The Yaygir were an Australian Aboriginal tribe who traditionally lived in and around Coffs Harbour, New South Wales.
ground_truth: Gumbaynggir language