#include <bits/stdc++.h>
using namespace std;
#ifdef LOCAL
  #include "settings/debug.cpp"
  #define _GLIBCXX_DEBUG
#else
  #define Debug(...) void(0)
#endif
#define rep(i, n) for (int i = 0; i < (n); ++i)
using ll = long long;
using ull = unsigned long long;

int main() {
  int t;
  cin >> t;
  while (t--) {
    int n;
    cin >> n;
    string ans = "";
    rep(_, n / 2) ans += "ABACBC";
    if (n % 2 == 1) {
      ans.pop_back(), ans.pop_back();
      ans += "ABCBC";
    }
    cout << ans << endl;
  }
  return 0;
}