#include <bits/stdc++.h>
using namespace std;
using ll = long long;
const int mod = 998244353;

int N;
void solve(){
    cin >> N;
    if(N % 2 == 1){
        cout << "ABACABCBC";
        N -= 3;
    }
    while(N){
        cout << "ABACBC";
        N -= 2;
    }
    cout << endl;
}
int main(void){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);
    
    int t; cin >> t;
    while(t--)solve();
    return 0;
}