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I believe that a real coin will not have a specific pattern to it as there were 4Hs followed by 2Ts and then 5Hs which shows that you cannot predict what is coming next. However, a fake coin will have a similar pattern as it regularly changed for T to H and vice versa. We think that if we include multiple Hs or Ts it will seem unrealistic but it does the opposite. So we can easily spot fakes using this technique.