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Brewers oversee the production of many different styles of beer. They develop recipes that consist of various types and blends of the four basic ingredients: barley malt, hops, yeast, and water (and occasionally fruits, wheat, rice, and corn). Brewers add these ingredients into brewing vessels in accordance with the style of beer they are brewing and their own recipe. Brewers also tend to the brewing equipment. They monitor gauges and meters, as well as turn valves, open hatches, and occasionally stir.