import java.io.BufferedReader;
import java.io.IOException;
import java.io.InputStreamReader;
import java.util.Arrays;
import java.util.StringTokenizer;

public class Back_15657 {

    static int N, M;
    static int[] input;
    static int[] output;

    static StringBuilder sb = new StringBuilder();

    public static void main(String[] args) throws IOException {
        BufferedReader br = new BufferedReader(new InputStreamReader(System.in));
        StringTokenizer st = new StringTokenizer(br.readLine());
        N = Integer.parseInt(st.nextToken());
        M = Integer.parseInt(st.nextToken());

        input = new int[N];
        output = new int[M];

        st = new StringTokenizer(br.readLine());
        for (int i = 0; i < N; i++) {
            input[i] = Integer.parseInt(st.nextToken());
        }

        Arrays.sort(input); // 사전순 출력을 위해 정렬
        dfs(0, 0);
        System.out.print(sb);
    }

    private static void dfs(int start, int depth) {
        if (depth == M) {
            for (int i = 0; i < M; i++) {
                sb.append(output[i]).append(" ");
            }
            sb.append('\n');
            return;
        }

        for (int i = start; i < N; i++) {
            output[depth] = input[i];
            dfs(i, depth + 1); // 중복 허용
        }
    }
}