Stuck Numbers [Java Exam]

package com.sve;

import java.util.Arrays;
import java.util.Scanner;

public class Playground {

    public static void main(String[] args) {
        Scanner scan = new Scanner(System.in);
        int count = Integer.parseInt(scan.nextLine());
        int[] numbers = Arrays.stream(scan.nextLine().split("\\s+"))
                .mapToInt(Integer::parseInt)
                .toArray();
        boolean found = false;
        if (numbers.length < 4) {
            System.out.println("No");
            return;
        }
        for (int i = 0; i < numbers.length; i++) {
            int first = numbers[i];
            for (int j = 0; j < numbers.length; j++) {
                int second = numbers[j];
                if (second == first) {
                    continue;
                }
                for (int k = 0; k < numbers.length; k++) {
                    int third = numbers[k];
                    if (third == second || third == first) {
                        continue;
                    }
                    for (int l = 0; l < numbers.length; l++) {
                        int fourth = numbers[l];
                        if (fourth == third || fourth == second || fourth == first) {
                            continue;
                        }
                        String firstPair = first + "" + second;
                        String secondPair = third + "" + fourth;
                        if (firstPair.equals(secondPair)) {
                            System.out.println(first + "|" + second + "==" + third + "|" + fourth);
                            found = true;
                        }
                    }
                }
            }
        }
        if (found == false) {
            System.out.println("No");
        }
    }
}