Classify everybody on each characteristic, but on a simple binary scale. So each person is either short or tall, fat or thin .... whatever. Arbitrary I know, but bear with me.
Even with this level of crudity & arbitrariness there are enough categories to assign each of 1 million people to their own unique group of 1
2 possible categories of height x 2 categories of weight x 2 categories of intelligence x 2 categories of musical ability ...... 2 to the power of 20 = 1,048,576 categories in all
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