lo.cpp

/*              |\ | |  ||\ \ /(_~     |~)|_~|\/||_~|\/||~)|_~|~)
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*/                              
#include<bits/stdc++.h>
using namespace std;
 
#define fastio ios_base::sync_with_stdio(0); cin.tie(0)
#define LL long long 
#define mod 1000000007 
#define FOR(i, j, k) for (int i=j ; i<k ; i++)
#define ROF(i, j, k) for (int i=j ; i>=k ; i--) 
#define debug(...) fprintf(stderr, __VA_ARGS__), fflush(stderr)
#define time__(d) for(long blockTime = 0; (blockTime == 0 ? (blockTime=clock()) != 0 : false); debug("%s time : %.4fs", d, (double)(clock() - blockTime) / CLOCKS_PER_SEC))

const long long INF = 1e18;
const long long MAX = 1e5+10;
int main(){
    fastio;
    int t=1; cin>>t;
    while(t--){
        int n ;  cin>>n;
        vector<vector<int>>a(n+1,vector<int>(n+1,0));
        FOR(i,1,n+1)  {
             string s;cin>>s; 
            FOR(j,1,n+1) {
                a[i][j]=s[j-1]-'0';
            }
        }
    
        bool pos = true;
        FOR(i,1,n){
            FOR(j,1,n){ 
                if(a[i][j] && (a[i+1][j] || a[i][j+1])){
                    continue;
                }
                // else if(a[i][j]  ) {
                //     FOR(k,j+1,n+1) if(a[i][j] && c[n][k]-c[i-1][k] < n-i+1) pos=false;
                //       break;
                // }
                 else if(a[i][j]) pos= false;
            }
        }
              
        if(!pos) cout<<"NO"<<"\n";
        else cout<<"YES"<<"\n";
    }
}