#include"bits/stdc++.h"
//#include"atcoder/all"
using namespace std;
//using namespace atcoder;
#pragma GCC target("avx2")
#pragma GCC optimize("O3")
#pragma GCC optimize("unroll-loops")
using ll = long long;
using ld = long double;
#define rep(i,m,n) for(ll i=(ll)m;i<(ll)n;i++)
#define drep(i,m,n) for(ll i=m-1;i>=n;i--)
#define Endl endl
#define pr(i,j) make_pair(i,j) 
#define isin(x,l,r) (l<=x&&x<r)
#define chmin(a,b) a=min(a,b)
#define chmax(a,b) a=max(a,b)
#define srt(ar) sort(ar.begin(),ar.end())
#define rev(ar) reverse(ar.begin(),ar.end())
const ll inf = 1e18;
const ld pi = 3.14159265358979;
//using mint = modint998244353;
int main() {
	ios::sync_with_stdio(false);
	cin.tie(nullptr);

	ll t;
	cin >> t;
	while (t--) {
		ll n, x;
		cin >> n >> x;
		if (x < n * (n + 1) / 2)cout << -1 << Endl;
		else {
			ll t = x - (n) * (n + 1) / 2;
			rep(i, 0, n - 1)cout << i + 1 << " ";
			cout << n + t << endl;
		}
	}
}