import java.util.*;

// 제출시 class 명을 Main으로 바꿀것!
public class _15666 {
    static void dfs(int N, int M, int[] nums, int[] result, int current, int len){
        if(len == M) {
            for (int i=0; i<len; i++) {
                System.out.printf("%d ",result[i]);
            }
            System.out.printf("\n");
            return;
        }

        int prev = -1;
        for(int i=current; i<N; i++){
            if(nums[i] != prev) {
                result[len] = nums[i];
                dfs(N,M,nums,result,i,len+1);
                prev = nums[i];
            }
        }
    }
    public static void main(String[] args) {
        Scanner sc = new Scanner(System.in);
        int[] line = Arrays.stream(sc.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();
        int N = line[0], M = line[1];
        int[] nums = Arrays.stream(sc.nextLine().split(" ")).mapToInt(Integer::parseInt).toArray();
        Arrays.sort(nums);
        sc.close();

        int[] result = new int[M];
        dfs(N,M,nums, result,0,0);
    }
}