Author: Ismail Hosen
Daffodil International University
//Please Follow From Main Function
#include<bits/stdc++.h>
using namespace std;
string vc[100];
int main()
{
int n, tc;
cin>>tc;
while(tc--)
{
cin>>n;
for(int i=0; i<n; i++)
{
cin>>vc[i];
sort(vc[i].begin(), vc[i].end());
}
int p=0;
for(int j=0; j<n; j++)
{
if(p==0)
{
for(int i=1; i<n; i++)
{
if(vc[i][j]<vc[i-1][j])
{
p=1;
break;
}
}
}
else break;
}
if(p!=1)cout<<"YES"<<endl;
else cout<<"NO"<<endl;
}
return 0;
}
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