t = int(input())
for _ in range(t):
    n,x = map(int, input().split())
    s = x
    f = True
    ans = [0]*n
    for i in range(1, n):
        #print(s, i)
        if s > ans[i-2]:
            ans[i-1] = i
            s -= i
        else:
            f = False
    if s > ans[-2]:
        ans[-1] = s
        s = 0
    else:
        f = False
    #print(ans)
    if f == True:
        print(*ans)
    else:
        print(-1)