Split your batches and do experiments. My favorites are split batches identical with two different yeasts. Or you could sour one, or you could dry hop it differently, add fruit. That way, if you don't care for the final product, you only have half a batch to pawn off on your friends. Also, you can learn the differences in different yeasts, hops, etc.
I can't be arsed to keep up this list of what's in the fermenters, but hey, check out the cool brewery I own!
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