Study and summarize the 2011 anonymous 4chan lower-bound argument (and its later formalization, e.g. in Houston's or Egan's writeups) giving n! + (n-1)! + (n-2)! + n - 3 as a lower bound on superpermutation length; confirm this evaluates to 5884 for n=7, and explain in your own words where the 22-character gap between 5884 and 5906 is understood (or not understood) to come from.
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