def doubled_sequence(n):
    if n % 2 != 0:
        return -1
    else:
        sequence = []
        for i in range(1, n // 2 + 1):
            sequence.append(i)
            sequence.append(n - i + 1)
        return ' '.join(map(str, sequence))

t = int(input())

for _ in range(t):
    n = int(input())
    print(doubled_sequence(n))