#include <stdio.h>
#include <stdlib.h>
struct node
{
    int a;
    struct node *next;
};
int main()
{
    struct node *p, *q, *head, *tail;
    int n, i, m, k, b;
    scanf("%d", &m);
    while(m--)//建立連結串列，並輸入第一個值
    {
    scanf("%d", &n);
    head = (struct node *)malloc(sizeof(struct node));
    head->next = NULL;
    q = head;
    p = (struct node *)malloc(sizeof(struct node));
    scanf("%d", &p->a);
    p->next = NULL;
    q->next = p;
    q = p;
    n--;
    while(n--)//輸入值，判斷是否重複
    {
        int t = 1;
        tail = head;
        p = (struct node *)malloc(sizeof(struct node));
        scanf("%d", &k);
        while(tail->next!=NULL)
        {
            tail = tail->next;
            if(tail->a == k)//重複退出
                {
                    t = 0;
                    break;
                }
        }
        if(t)//不重複指向下一個
        {
             p->a = k;
             p->next = NULL;
             q->next = p;
             q = p;
        }
    }
    p = head;
    while(p->next!=NULL)//輸出連結串列
    {
        p = p->next;
        printf("%d ", p->a);
    }
    printf("\n");
    }
}