#include <iostream>
using namespace std;

int main() {
    int T, N;
    cin >> T;
    while (T--) {
        cin >> N;

        while (N) {
            if (N % 2) {
                N -= 3;
                cout << "ABACABCBC";
            } else {
                N -= 2;
                cout << "ABACBC";
            }
        }

        cout << '\n';
    }
}