import sys, math
sys.setrecursionlimit(10**8)
sys.set_int_max_str_digits(0)

T = int(input())

for i in range(T):
    N = int(input())

    if N%2 == 0:
        ans = 'ABACBC'*(N//2)
    else:
        N -= 3
        ans = 'ABACBACBC' + 'ABACBC'*(N//2)

    print(ans)