T = int(input())
for _ in range(T):
    N, X = map(int, input().split())
    if N * (N + 1) // 2 > X:
        print(-1)
        continue
    ans = []
    for i in range(1, N + 1):
        ans.append(i)
    ans[-1] += X - sum(ans)
    print(*ans)