iiitv/ChefLib

// code written by heet
#include <iostream>
#include <cstring>

using namespace std;

int main() {
    int t;
    cin >> t;
    while (t--) {
        string s;
        cin >> s;
        int a[26] = {0};
        int n = s.size();
        bool isbreak = false;
        for (int i = 0; i < n; ++i) {
            a[(int)s[i] - 97]++;
            if(a[(int)s[i] - 97 ] == 2) {
                cout << "yes\n";
                isbreak = true;
                break;
            }
        }
        if(!isbreak)
            cout << "no\n";
    }
        return 0;
}