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#include<iostream>
#include<vector>
using namespace std;
int w1,w2;
bool gaveOver(int guess[], int right[]){
         int totalRight = 0;
         int rightColor = 0;
         int grab;
         bool exclude[4];
         bool excludeColor[4];
         bool inList = false;
         for (int i = 0; i < 4; i++){
             exclude[i] = false;
             excludeColor[i] = false;
         }
         for (int i = 0; i < 4; i++)
         {
             if (guess[i] == right[i])
             {
                totalRight++;
                exclude[i] = true;
             }
         }
         for (int i = 0; i < 4; i++)
         {
             if (!exclude[i])
             {
                for (int j = 0; j < 4; j++)
                {
                    if (!exclude[j] && i != j)
                    {
                       if ((guess[i] == right[j]) && !excludeColor[j])
                       {
                          inList = true;
                          grab = j;
                       }
                    }
                }

                if (inList)
                {
                   rightColor++;
                   inList = false;
                   excludeColor[grab] = true;
                }
             }
         }
         if(totalRight == w1 && rightColor == w2){
                return true;
         }
         else{
            return false;
         }
    }
int main(){
    int t;
    cin>>t;
    for(int k=0;k<t;k++){
        int a;
        cin>>a;
        int u;
        vector<int>s;
        for(int i=0;i<=9999;i++){
            s.push_back(i);
        }
        bool b=1;
        int one[4];
        int two[4];
        for(int i=0;i<a;i++){
            cin>>u>>w1>>w2;
            two[0] = u/1000;
            two[1] = (u/100)%10;
            two[2] = (u/10)%10;
            two[3] = u%10;
            for(int j=0;j<s.size();j++){
                one[0]=s[j]/1000;
                one[1]=(s[j]/100)%10;
                one[2]=(s[j]/10)%10;
                one[3]=s[j]%10;
                if(!gaveOver(one,two)){
                    s.erase(s.begin()+j);
                }
                else{
                    cout<<s[j]<<endl;
                }
            }
    }
    if(s.size() > 1){
            cout<<0<<endl;
        }
        else{
            cout<<s.back()<<endl;
        }
    }
return 0;
}