#include <bits/stdc++.h>   using namespace std;   int main() {     int t;     cin >> t;     while (t--) {       int mid, i, j;       string a;       cin >> a;       if ((a.length()) % 2) {         cout <<  NO n ;         continue;       }       mid = (a.length()) / 2;       j = mid;       i = 0;       while (i < mid) {         if (a[i] == a[j]) {           i++;           j++;         } else {           cout <<  NO n ;           break;         }       }       if (i == mid) {         cout <<  YES n ;       }     }   }   