#include <bits/stdc++.h>   using namespace std;   int main() {     long long t;     cin >> t;     while (t--) {       long long n, a, b;       cin >> n >> a >> b;       string s, ans;       for (long long i = 0; i < b; i++) {         long long m =  a ;         char c = m + i;         s += c;       }       for (long long i = 0; i < (n / b); i++) {         ans += s;       }       long long m = ans.length();       for (long long i = 0; i < n - m; i++) {         ans += s[i];       }       cout << ans << endl;     }   }   