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import java.util.Arrays;

class Solution {
    public int solution(int[] numbers) {
        int first = Arrays.stream(numbers).max().orElse(0);
        int second = 0;
        for (int number : numbers) {
            if (number < first && number > second) {
                second = number;
            }
        }
        int answer = first * second;
        return answer;
    }
}