#include <bits/stdc++.h>   using namespace std;   int main() {     ios::sync_with_stdio(false);     cin.tie(0);     long long int j, n, m, po, a, b, no, flag, cnt = 0, t, cnt2, ar[200001], x, y,                                                i, co[200001], sum = 0, k,                                                ans = INT_MIN, sum1 = 0;     string str[1000], ptr, tr, rtr, rt;     vector<long long int> v1, v2;     set<string> s;     set<long long int> si;     queue<long long int> qui;     queue<string> qus;     set<string>::iterator it;     cin >> t;     while (t--) {       cin >> n >> a >> b;       string sr;       for (i = 0; i < a; i++) {         sr[i] = char( a  + i % b);       }       for (i = 0; i < n; i++) {         cout << sr[i % a];       }       cout << endl;     }   }   