T = int(input())

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