def calc(N,X):
    tmp = N*(N+1)//2
    if tmp > X:
        print(-1)
    else:
        res = [i for i in range(1,N+1)]
        ADD = X - tmp
        res[-1] += ADD
        print(*res)

T = int(input())
for i in range(T):
    n,x = map(int, input().split())
    calc(n,x)