#include <bits/stdc++.h>
using namespace std;
typedef signed long long ll;

#undef _P
#define _P(...) (void)printf(__VA_ARGS__)
#define FOR(x,to) for(x=0;x<(to);x++)
#define FORR(x,arr) for(auto& x:arr)
#define ITR(x,c) for(__typeof(c.begin()) x=c.begin();x!=c.end();x++)
#define ALL(a) (a.begin()),(a.end())
#define ZERO(a) memset(a,0,sizeof(a))
#define MINUS(a) memset(a,0xff,sizeof(a))
//-------------------------------------------------------

int T,N;
int A[101][101];

void solve() {
    int i,j,k,l,r,x,y; string s;
    
    cin>>T;
    while(T--) {
        cin>>N;
        FOR(y,N) FOR(x,N) cin>>A[y][x];
        int ng=0;
        FOR(y,N) FOR(x,N) {
            if(x&&A[y][x]==A[y][x-1]) ng=1;
            if(y&&A[y][x]==A[y-1][x]) ng=1;
        }
        if(ng) cout<<"No"<<endl;
        else cout<<"Yes"<<endl;
    }
}


int main(int argc,char** argv){
    string s;int i;
    if(argc==1) ios::sync_with_stdio(false), cin.tie(0);
    FOR(i,argc-1) s+=argv[i+1],s+='\n'; FOR(i,s.size()) ungetc(s[s.size()-1-i],stdin);
    cout.tie(0); solve(); return 0;
}