#include <bits/stdc++.h>

using namespace std;

int main() {
    int T;
    cin >> T;
    while (T--) {
        long long N, X;
        cin >> N >> X;
        if (N * (N + 1) / 2 > X) {
            cout << -1 << endl;
            continue;
        }
        long long sum = 0;
        vector<long long> A(N);
        for (int i = 0; i < N; i++) A[i] = i + 1, sum += i + 1;
        A[N - 1] += X - sum;
        for (long long l: A) cout << l << ' ';
        cout << endl;
    }
    return 0;
}