I have to respectfully disagree on one point. I have made successful starters from grapes and various whole grain flours, but it will work with commercial yeast. I have no scientific data to back this up, but my hunch is that flour, water, and a pinch of commercial yeast starts the fermentation process. At some point the ferment Ph becomes inhospitable to the commercial yeast microflora, and the wild yeasts in my house take over.
It has worked for me. YMMV.
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