#include <cmath>
#include <cstdio>
#include <vector>
#include <iostream>
#include <algorithm>
using namespace std;


int main() {
    /* Enter your code here. Read input from STDIN. Print output to STDOUT */   
   int i,n,t,x,j;
    string s[200];
    cin>>t;
    while(t--)
    { x=0;
        cin>>n;
        for(i=0;i<n;i++)
        {
            cin>>s[i];
        }
        for(i=0;i<n;i++)
        {
            for(j=0;j<s[i].length();j++)
            {
                x+=(int)s[i][j]-'0';
            }
        }
        if(x%3)
            cout<<"No"<<endl;
        else cout<<"Yes"<<endl;
    }
        
        return 0;
}