t = int(input())

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