T = int(input())
for _ in range(T):
    N,X = map(int,input().split())
    if N*(N+1)//2<=X<(N+1)*(N+2)//2:
        k = X-N*(N+1)//2
        ans = list(range(N,0,-1))
        for i in range(k):
            ans[i] += 1
        print(*ans)
    else:
        print(-1)