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> Are the forum rules crystal clear about these possible cases or there are no such rules at all? <
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It sees pretty clear to me in principle:
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> 25. Ban evasion (using or creating accounts while one of your accounts is banned) is not allowed. <
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The concept is clear. What is not easy is to actually enforce it, as finding out which alts people have is not trivial nor even possible for the most (the forum could play around with IPs, but that still would not work for many cases, nor is it the forums intent to pursue the issue with Torquemada type perseverance and techniques).