Question: In which city is the headquarters of the parent company of WesCEF ?

full_context: Document 1: Coles Supermarkets: Coles Supermarkets Australia Pty Ltd, trading as Coles, is an Australian supermarket chain owned by Wesfarmers.
Document 2: CSBP: CSBP Limited is an Australian fertiliser and chemical company based in Kwinana, Western Australia. It is a subsidiary of WesCEF, which in turn is part of the industrials division of the Wesfarmers conglomerate.
Document 3: Carlton &amp; United Breweries: Carlton & United Breweries (CUB Pty. Ltd.) is an Australian brewing company that operates as a subsidiary of Foster's Group. It is based in Abbotsford, a suburb of Melbourne, Victoria. In 1983 it became a wholly owned subsidiary of Elders IXL and CUB was delisted. In 1990, Elders IXL was renamed as Foster's Group, and in July 2004, CUB changed its name to Carlton & United Beverages. In February 2009, Foster's announced the decision to separate the Australian Wine division from the Australian Beer, Cider & Spirits (BCS) division, and rename BCS to Carlton & United Breweries.
Document 4: Jasol Chemical Products: Jasol Chemical Products was a chemicals manufacturing company founded in Adelaide, South Australia by Charles George Johnson in 1934. It was well known in that state and Western Australia for its cleaning products and disinfectants, notably Jasol B. The brand is now owned by George Weston Foods. The name "Jasol" was an acronym of "Johnson's Antiseptic Soluble Oils Limited".
Document 5: Economy of Western Australia: The Western Australian economy is a state economy dominated by its resources and services sector and largely driven by the export of iron-ore, gold, liquefied natural gas and agricultural commodities such as wheat. Covering an area of 2.5 million km, the state is Australia's largest, accounting for almost one-third of the continent. Western Australia is the nation's fourth most populous state, with 2 million inhabitants (10% of the national population).
Document 6: CF Industries: CF Industries Holdings, Inc. is a North American manufacturer and distributor of agricultural fertilizers, based in Deerfield, Illinois, a suburb of Chicago. It was founded in 1946 as the Central Farmers Fertilizer Company. For its first 56 years, it was a federation of regional agricultural supply cooperatives. CF then demutualized, and became a publicly traded company.
Document 7: Foodworks: FoodWorks is the brand the Australian independent retail supermarket group Australian United Retailers Limited (AURL) trade under. The AURL was created in November 2004 from the Merger of the FoodWorks Supermarket Group Ltd (FSG) and Australian United Retailers (AUR). Its main competitors are Woolworths, Coles, Bi-Lo, IGA, and Aldi. It is Australia's second largest leading independent supermarket retailing group, supporting in excess of $1.35 billion in annual sales at the retail level.
Document 8: List of Woolworths Limited companies: List of Woolworths Limited companies is a compilation of the divisions, chains, and brands of Woolworths Limited, a major Australian company with extensive retail interest throughout Australia and New Zealand. It is the second-largest company in Australia by revenue, after Perth-based retail-focused conglomerate Wesfarmers, and the largest food retailer in Australia, as well as the second largest in New Zealand. In addition, Woolworths Limited is the largest takeaway liquor retailer in Australia, the largest hotel and gaming poker machine operator in Australia, and was the 19th largest retailer in the world in 2008.
Document 9: BASF Plant Science: BASF Plant Science is a subsidiary of BASF in which all plant biotechnology activities are consolidated. The GmbH was founded in 1998 and employs approximately 700 people at 6 different locations worldwide. The headquarters of BASF Plant Science is located in Research Triangle Park (North Carolina, USA). Plant Science has research sites in the US, Canada and Europe. At these locations the company is mainly developing genetically modified seeds.
Document 10: Wesfarmers: Wesfarmers Limited is an Australian conglomerate, headquartered in Perth, Western Australia, with interests predominantly in Australian and New Zealand retail, chemicals, fertilisers, coal mining and industrial and safety products. With AU$65.98 billion in the 2016 financial year, it is the largest Australian company by revenue, overtaking Woolworths and BHP Billiton. Wesfarmers is the largest private employer in Australia, with approximately 205,000 employees.
Document 11: Westfield Corporation: Westfield Corporation is an Australian-based British-American shopping centre company with retail destinations in England and the United States. It was created in June 2014 when Westfield Group separated its Australian and New Zealand businesses from its international operations.
Document 12: Seven West Media: Seven West Media Limited is an ASX-listed media company and is Australia's largest diversified media business, formed by the acquisition by West Australian Newspapers Holdings Limited (WAN) of the Seven Media Group. It has a leading presence in broadcast television, radio, newspaper publishing, magazine publishing and online. Seven Group Holdings Ltd (SGH), a company controlled by Australian Capital Equity, is Seven West Media's largest shareholder with 33.2% of Seven West Media shares and $250m Seven West Media convertible preference shares (CPS).
Document 13: Incitec Pivot: Incitec Pivot Ltd. () is an Australian multinational corporation that manufactures fertiliser, explosives chemicals, and mining service. Incitec Pivot is the largest supplier of fertilisers in Australia; the largest supplier of explosives products and services in North America; and the second largest supplier of explosives products and services in the world. The company began trading on the ASX on 30 July 2003 having been formed as the result of a merger between Incitec Fertilizers and the Pivot group, and substantially expanded with the acquisition of Southern Cross Fertilisers in 2006 and Dyno Nobel in 2008.
Document 14: Coles Group: Coles Group Limited (formerly Coles Myer Limited) was an Australian public company that operated numerous retail chains. It was Australia's second-largest retailer, behind Woolworths Limited. It was acquired by Western Australian public company Wesfarmers, with transfer of ownership on 23 November 2007. The corporate operations ceased at head office in Melbourne from that point, now based at Wesfarmers head office in Perth.
Document 15: Ceres Fruit Juices: Ceres Fruit Juices Pty Ltd, trading as The Ceres Beverage Company, is a beverage company based in Paarl, South Africa. It produces fruit juice and other fruit based products and is a subsidiary of Pioneer Foods.
ground_truth: Perth