t = int(input())

for i in range(t):
    n,x = map(int,input().split())
    ans = []
    cnt = 0
    for j in range(1,n):
        ans.append(j)
        cnt += j
    
    if x - cnt > n - 1:
        ans.append(x - cnt)
        print(*ans)
    else:
        print(-1)