import collections,sys,math,functools,operator,itertools,bisect,heapq,decimal,string,time,random
#sys.setrecursionlimit(10**9)
#sys.set_int_max_str_digits(0)
#input = sys.stdin.readline
t = int(input())
#alist = list(map(int,input().split()))
#alist = []
#s = input()
#n,m = map(int,input().split())
#for i in range(n):
#    alist.append(list(map(int,input().split())))
a = 'ABACBC'
b = 'ABACABCBC'
for i in range(t):
    n = int(input())
    if n % 2 == 0:
        for j in range(n//2):
            print(a,end='')
    else:
        for j in range(n//2-1):
            print(a,end='')
        print(b,end='')
    print()