N = int(input())
dic = {}
for _ in range(N):
    input()
    M, _ = map(int, input().split())
    for s in input().split():
        dic[s] = dic.get(s, 0) + 1
li = list(dic.items())
li = sorted(li, key=lambda x:(-x[1], x[0]))
for i in range(min(10, len(li))):
    print(li[i][0],li[i][1])