백준(BaekJoon)_15654_N과M(5)

n, m = map(int, input().split())
num_list = list(map(int, input().split()))

answer = []
def func():
    if len(answer) == m:
        print(" ".join(map(str, answer)))
    else:
        num_list.sort()
        for i in range(len(num_list)):
            if num_list[i] not in answer:
                answer.append(num_list[i])
                func()
                answer.pop()
    
func()