#include<stdio.h>
void solve()
{
	int n;
	scanf("%d", &n);
	for (; n > 3; n -= 2)
		printf("ABACBC");
	if (n == 3)
		printf("ABACABCBC\n");
	else
		printf("ABACBC\n");
	return;
}
int main()
{
	int t;
	scanf("%d", &t);
	for (; t > 0; t--)
		solve();
	return 0;
}