import sys

inf = float("inf")
# sys.setrecursionlimit(10**6)
input = lambda: sys.stdin.readline().rstrip("\r\n")

print = lambda *args, end="\n", sep=" ": sys.stdout.write(
    sep.join(map(str, args)) + end
)


def II():
    return int(input())


def MII(b=0):
    return map(lambda x: int(x) - b, input().split())


def LII(b=0):
    return list(MII(b))


for _ in range(II()):
    n = II()
    res = ["ABAC"]
    for _ in range(n - 2):
        res.append("ABC")
    res.append("BC")
    print("".join(res))