#include <bits/stdc++.h>
using namespace std;

int main(){
    ios_base::sync_with_stdio(false);
    cin.tie(nullptr);

    int t; cin >> t;
    while(t--){
        int N; cin >> N;
        string two = "ABACBC",three = "ABACABCBC",answer = "";
        if(N%2) answer = three,N -= 3;
        while(N) answer += two,N -= 2;
        cout << answer << endl;
    }
}