On substituting sourdough: if it is based on equal parts flour and water, when substituting 8 oz of sourdough, why is the 3 cups flour reduced by 1 cup (8 oz) and the 1 cup of liquid by 1/2 cup (4 oz)? Doesn't that make 12 oz? Please clarify why the reduction isn't 4 oz for both flour and liquid? Is this the new math?

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