They cite Bavarian Purity Requirements that date to Duke William IV in 1516, which allow only water, hops, and barley to be used in the brewing process.

他们以1516年威廉公爵四世公布的德国啤酒纯度条约为证，该条约规定，只有水、啤酒花、大麦可用于酿造啤酒。

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In the Matter of William Luther Crull, IV, Respondent (AWC 2010025740701, November 2, 2012).

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