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    my ($left,$middle,$right) = $sequence =~ m/(\w{$_})?(\w{1})?(\w*)/;
                                                    ^
    
  2. or download this
                  A  CTGACN
          A       C   TGACN
    ...
       ACTG       A      CN
      ACTGA       C       N
     ACTGAC       N