func_code_string: #include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int n;       cin >> n;       vector<string> v(n);       for (int i = 0; i < n; i++) {         cin >> v[i];       }       int a[26] = {0};       for (auto s : v) {         for (auto i : s) {           a[i -  a ]++;         }       }       int f = 0;       for (int i = 0; i < 26; i++) {         if (a[i] % n) {           f = 1;           break;         }       }       if (f) {         cout <<  NO  << endl;       } else {         cout <<  YES  << endl;       }     }   }   