private static void printDups(Collection<String> files) {
    if (files.size() > 1) {
      System.out.println("Duplicate " + files.size() + " files");
      for (String file : files) {
        System.out.println(file);
        totalDups++;
      }
      totalClusters++;
      System.out.println();
    }
  }
private static void printDups(Collection<String> files)