Scanner s = new Scanner(System.in); int t = s.nextInt();

    // Stream to read and process input pairs
    Set<String> uniquePairs = new HashSet<>();

    // We use a Stream to process the input and maintain uniqueness
    IntStream.range(0, t).forEach(i -> {
        String left = s.next();
        String right = s.next();

        // Create the two possible pair strings
        String pair1 = left + " " + right;
        String pair2 = right + " " + left;

        // Add the lexicographically smaller of the two pairs to the set
        uniquePairs.add(Stream.of(pair1, pair2)
                              .min(String::compareTo) // Get the lexicographically smaller string
                              .get());

        // Print the current number of unique pairs
        System.out.println(uniquePairs.size());
    });