T = int(input())
l = []
l1 = []
ans = []
for i in range(T):
    l.append(int(input()))
    l1.append(list(map(float,input().strip().split())))
    ans.append([])
for i in range(len(l1)):
    for j in range(l[i]):
        if(l1[i][j] not in ans[i]):
            ans[i].append(l1[i][j])
for i in range(len(ans)):
    for j in range(len(ans[i])):
        print(str(int(ans[i][j])),end=' ')
    print()