I just received my sourdough starter and fed it the first time. The volume is about 1 1/2 cups water and 2 cups flour. I've waited 12 hours and the starter is very bubbly. The last sentence of Step 1 reads: "Stir the starter and measure out about 4 ounces (about 1/2 cup)." Step 2 reads "Mix in 1/2 cup water and 4 ounces (1 scant)n cup flour. Stir well...." My question: am I mixing the 1/2 cup water and 4 ounces of Step 2 into the remaining starter or into the 4 ounces that were measured out? I suspect it's the latter but want to confirm. Thanks!

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