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  HANDEL => SL??HO
  LEHRER => OH??KN
  MOZART => NL??MZ
  CHOPIN => LK??DR

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  while (<>) {
    while (/\G(\W*)(\w)(\W*)(\w)(\W*)/gc) {
...
    }
    print $1 if /\G(.*\n?)$/gc;
  }