/* -*- coding: utf-8 -*-
 *
 * 2614.cc:  No.2614 Delete ABC - yukicoder
 */

#include<cstdio>
#include<algorithm>
 
using namespace std;

/* constant */

const int MAX_N = 100;
const int MAX_N3 = MAX_N * 3;
const char pat0[] = "ABACBC";
const char pat1[] = "ABC";

/* typedef */

/* global variables */

char s[MAX_N3 + 4];

/* subroutines */

/* main */

int main() {
  int tn;
  scanf("%d", &tn);

  while (tn--) {
    int n;
    scanf("%d", &n);

    copy(pat0, pat0 + 6, s);
    int k = 6;

    for (int i = 2; i < n; i++, k += 3)
      copy(pat1, pat1 + 3, s + k);
    s[k] = '\0';

    puts(s);
  }

  return 0;
}