백준(BaekJoon)_15656_N과 M(7)

n,m = map(int, input().split())
num_list = list(map(int, input().split()))
answer = []
def func(start):
    if m == len(answer):
        print(" ".join(map(str, answer)))         
    else:
        num_list.sort()
        for i in range(start, n):
            answer.append(num_list[i])
            func(0)
            answer.pop()
            
func(0)