n = int(input())
ans = list()
for t in range(n):
    q = int(input())
    a = input().split()
    res = []
    for i in a:
        for k in a:
            for j in a:
                if len(set(i + k + j)) == 10:
                    res.append((i, k, j))
    ans.append(res[0])
for i in ans:
    print(*i)