These vaccines will be produced in batches of specific sizes based on the size of the reactors they are using. So maybe they've got a couple of 10L reactors and a few 8L reactors for example, so the number of vaccines in different lots can vary, but there will be repeating sizes in there. If we had that info we could further properly weight the danger of these lots.

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I'm not letting my ship get shot out from under my ass! Open fire! - Captain Lindemann