 
 <prompt> Wetin di small vat wey dem dey fill dey do for di wort? Based on di question wey dey before dis one, write one context wey get di answer. E fit be 1 - 20 sentences. Context: <response>: After boiling, the hopped wort don cool, e dey ready for the yeast. For some breweries, the hopped wort fit pass through a hopback, wey be small container wey full with hops, to add aroma of hops and to act as filter; but usually the hopped wort just dey cool for the fermenter, where dem go add yeast. During fermentation, the wort dey turn beer for process wey fit take one week to months depending on the type of yeast and strength of the beer. Apart from producing ethanol, fine particles wey dey suspended for the wort go settle during fermentation. Once fermentation don complete, the yeast go settle too, e go leave the beer clear. 