#include <iostream>

 #include <sstream>

 #include <cstdio>

 #include <cstring>

 #include <cmath>

 #include <string>

 #include <vector>

 #include <set>

 #include <cctype>

 #include <algorithm>

 #include <cmath>

 #include <deque>

 #include <queue>

 #include <map>

 #include <stack>

 #include <list>

 #include <iomanip>

 using namespace std;

 #define INF 0x7fffffff

 #define eps 1e-5

 const int maxn = ;

 const int maxl = ;

 int a[maxn], vis[maxn];

 int n;

 bool Judge(int k)

 {

     bool zero = false;

     for(int i = ; i <= n; i++)

     {

         if(a[i] && a[i] != k)

             return ;

         if(!a[i])   zero = true;

 //        printf("%d ", a[i]);

     }

     if(zero)    return ;

     else return ;

 }

 int main()

 {

     int T;

     scanf("%d", &T);

     while(T--)

     {

         memset(vis, , sizeof(vis));

         memset(a, , sizeof(a));

         int cnt = ;

         scanf("%d", &n);

         for(int i = ; i <= n; i++)

             scanf("%d", &a[i]);

         a[n+] = a[];

         int cur = , zero = ;

         while(cur <= )

         {

 //            cout << "----" <<endl;

             for(int i = ; i <= n; i++)

             {

                 a[i] = abs(a[i]-a[i+]);

             }

             a[n+] = a[];

             //cout << num << endl;

             zero = ;

             for(int i = ; i <= n; i++)

                 if(!a[i])

                     zero++;

 //            cout << num << endl;

             if(zero == n)

             {

                 printf("ZERO\n");

                 zero = -;

                 break;

             }

             cur++;

         }

         if(zero != -)     printf("LOOP\n");

     }

     return ;

 }