boj_15657

def dfs(s,b,numList, num):
    if len(s) == b:
        print(' '.join(map(str,s)))
        return
    for i in range(num,len(numList)):
        s.append(numList[i])
        dfs(s, b, numList, i)
        s.pop()

a, b = map(int,input().split())
numList = list(map(int,input().split()))
numList.sort()
s= []
for i in range(len(numList)):
    s.append(numList[i])
    dfs(s,b, numList, i)
    s = []