#include <bits/stdc++.h>

using namespace std;

bool build(long len, long c, vector<int>& res, int start) {
    long max_c = len*(len-1)/2;
    if (c > max_c)
        return false;
    if (c == max_c) {
        res.resize(len);
        for(int i=0; i<len; ++i) {
            res[i] = start+i;
        }
        return true;
    }
    return false;
}

int main(){
    int T;
    cin >> T;
    for(int t = 0; t < T; ++t){
        long len, c;
        cin >> len >> c;
        vector<int> res;
        if (build(len, c, res, 1)) {
            for(int i=0; i<res.size(); ++i) {
                if (i) cout << " ";
                cout << res[i];
            }
            cout << endl;
        } else {
            cout << "-1" << endl;
        }
        
        
    }
    return 0;
}