#include <bits/stdc++.h>

#define ll long long
#define ld long double
using namespace std;

int main() {
    ll q;
    cin >> q;
    for (ll i = 1; i <= q; i++)
    {
        ll n,c;
        cin >> n >> c;
        if ((n)*(n-1)/2 == c)
        {
            for (ll j = n; j >= 1; j--)
                cout << j << " ";
            cout << endl;
            continue;
        } else if (c == 0)
        {
            if (n == 1) cout << 1 << endl;
            else cout << -1 << endl;
            continue;
        } else if (2*n-4 == c && n % 2 != 0)
        {
            ll a[n+1];
            ll k = 1;
            for (ll j = (n+1)/2; j <= n; j++)
            {
                a[j] = k;
                k+=2;
            }
            k = (n % 2 == 0 ? n : n-1);
            for (ll j = 1; j < (n+1)/2; j++)
            {
                a[j] = k;
                k = k - 2;
            }
            for (ll j = 1; j <= n; j++)
                cout << a[j] << " ";
            cout << endl;
            continue;
        }
        else cout << -1 << endl;
    }
    return 0;
}