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oddcomp (version 5.0.0.1)
If you want to count frequencies in a 40 aa stretch you should enter 40 here
The amino acid code B represents Asparagine or Aspartic acid and the code Z represents Glutamine or Glutamic acid. These are not commonly used codes and you may wish not to count words containing them, just noting them in the count of 'Other' words
You can view the original documentation here.