/*Every day, the words cross my mind. "If I had done this back then..."
but they don't take the sincere form of regret.
The words are just an excuse that come to my mind then disappear.*/
#include <bits/stdc++.h>
#define MAX 200005
#define inf 10000000000000000
#define ll long long
#define eps 0.00000000001
#define MOD 1000000007
#define s(x) scanf("%d", &x);

using namespace std;

ll a[MAX];
void rec( int idx) {
    if(idx == 1) {

    } else if( idx == 2 ) {

    } else {
        cout << idx << endl;
        ll y = ((ll) idx * ( (ll) idx - 1)) /2;

    }
}
int main() {
    int q;
    cin >> q;
    while(q--) {
        ll len , c1;
        cin >> len >> c1;

        ll x = (len * (len - 1))/2;
        if(len == 1) {
                if(c1 == 0) {
                    cout << 1 << endl;
                } else {
                    cout << -1 << endl;
                }
                return 0;
        }else if(c1 > x ) {
            cout << -1 << endl;
            return 0;
        } else if (n >= 2  && n <= 34 && c1 < (1LL <<(n-2))) {
            cout << -1 << endl;
            return 0;
        } else {
            if(c1 == (len *(len  - 1))/2 ) {
                for(int i = 0; i < n; i++) {
                    cout << i + 1 << " ";
                }
                cout << endl;
            } else {
                for(int i =0; i < n; i++) {
                    cout << i + 1 << " ";
                }
                cout << endl;
            }

        }
    }
    return 0;
}