def generate_string(N):
    dp = [["" for _ in range(3)] for _ in range(N+1)]
    dp[1] = ["A", "B", "C"]

    for i in range(2, N+1):
        dp[i][0] = min(dp[i-1][1] + "A", dp[i-1][2] + "A")
        dp[i][1] = min(dp[i-1][0] + "B", dp[i-1][2] + "B")
        dp[i][2] = min(dp[i-1][0] + "C", dp[i-1][1] + "C")

    return min(dp[N])

T = int(input())
for _ in range(T):
    N = int(input())
    result = generate_string(N)
    if result is not None:
        print(result)