Its neither sow nor sew because it isn't a word its an acronym. If you choose to pronounce it like a three letter word there's really no "wrong" way to do it, but really the letters do make the existing word sow like the pig. To be actually correct you should be saying "ess-oh-dubbleyoo" but that takes a lot longer than pronouncing it like a three letter word at which point you might as well just say "spirrituvewulf".
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