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" ... Imagine we process 100 people in this way. First samples have to be collected from each person being tested. Next, we divide each person’s sample into three; their sample will be tested three different times. Each of those three tests will combine samples from thirty different people; when such a test comes back positive, we know that someone among those thirty is infected. Depending on which pools come back negative or positive a mathematical algorithm can decide which individuals have Covid-19 and which do not. The math problem is similar to a logic puzzle or sudoku. ... "