#include <bits/stdc++.h>
using namespace std;
using ll = long long;
using P = pair<ll, ll>;
using T = tuple<ll, ll, ll>;
// #include <atcoder/all>
// using namespace atcoder;
// using mint = modint1000000007;
#define rep(i, n) for(ll i = 0; i < n; i++)

int main() {
    cin.tie(nullptr);
    ios_base::sync_with_stdio(false);
    
    ll t; cin >> t;
    while(t--) {
        ll n, x; cin >> n >> x;
        if( x < (1+n)*n/2 ) cout << -1 << endl;
        else {
            rep(i,n-1) cout << i+1 << " ";
            cout << x-(1+n)*n/2+n << endl;
        }
    }
    
    return 0;
}