#include <bits/stdc++.h>
using namespace std;
int main(){
  int T;
  cin >> T;
  for (int i = 0; i < T; i++){
    int N;
    cin >> N;
    string ans;
    while (N > 0){
      if (N != 3){
        ans += "ABACBC";
        N -= 2;
      } else {
        ans += "ABACABCBC";
        N -= 3;
      }
    }
    cout << ans << endl;
  }
}