import java.io.*;
import java.util.*;

public class Back_15655 {

    static int N, M;
    static int[] input, 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); // 오름차순 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 + 1, depth + 1); // 오름차순 유지
        }
    }
}