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People connecting from the same place will have similar to identical IP addresses. For example, two people living in the same city happen to be at the library on the same site on different computers. Thr library works with a singular ISP, therefore the IP address will be the same on every computer in the library.
We havr also had players in the same household before, and their IPs were the same. Only reason we knew it was two people was because their writing styles were vastly different.