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  1. or download this
    print "$_\n" for glob "{@{[ join ',', @letters ]}}" x $len;
  2. or download this
    join ',', @letters
  3. or download this
    {A,B,C,D,E,F}{A,B,C,D,E,F}{A,B,C,D,E,F}{A,B,C,D,E,F}
  4. or download this
    print "$_\n" for glob (('{'. join( ',', @letters).'}') x $len);
  5. or download this
    print "$_\n" for glob +('{'. join( ',', @letters).'}') x $len;