Correct, there are for example uncontacted tribes and other isolated individuals and groups throughout the world. It is exceedingly unlikely that every single living person globally is within 6 contacts of every other living person. However to rigorously determine this the exact definition of contact should be established, since with a loose definition of contact and allowing dead contacts there is a higher chance of the law being accurate. 6 contacts is however sufficient to reach a very large portion of the global population counterintuitive as this may seem.
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