/* ***********************************************
Author        :kuangbin
Created Time  :2016/3/12 19:12:59
File Name     :F:\ACM\2016ACM\BestCoder\BC75\B.cpp
************************************************ */

#include <stdio.h>
#include <string.h>
#include <iostream>
#include <algorithm>
#include <vector>
#include <queue>
#include <set>
#include <map>
#include <string>
#include <math.h>
#include <stdlib.h>
#include <time.h>
using namespace std;

int vis[3][3];
bool check(int a[],int n) {
    if(n < 4)return false;
    for(int i = 0;i < n;i++)
        if(a[i] <= 0 || a[i] > 9)
            return false;
    memset(vis,false,sizeof(vis));
    int x = (a[0]-1)/3;
    int y = (a[0]-1)%3;
    vis[x][y] = true;
    int px = x;
    int py = y;
    for(int i = 1;i < n;i++) {
        x = (a[i]-1)/3;
        y = (a[i]-1)%3;
        if(vis[x][y])return false;
        vis[x][y] = true;
        if (x == px) {
            if (abs(y-py) == 2 && !vis[x][(y+py)/2])
                return false;
        } else if (y == py) {
            if (abs(x-px) == 2 && !vis[(x+px)/2][y])
                return false;
        } else if (abs(x-px) == 2 && abs(y-py) == 2 && !vis[1][1]) {
            return false;
        }
        px = x;
        py = y;
    }
    return true;
}

int a[100];
int main()
{
    //freopen("in.txt","r",stdin);
    //freopen("out.txt","w",stdout);
    int T;
    int n;
    scanf("%d",&T);
    while(T--) {
        scanf("%d",&n);
        for(int i = 0;i < n;i++)
            scanf("%d",&a[i]);
        if (check(a,n))puts("valid");
        else puts("invalid");
    }
    return 0;
}