#include<iostream>
#include<vector>
#include<algorithm>

using namespace std;
using ll = long long;


int main(){
    cin.tie(nullptr);
    ios::sync_with_stdio(false);

    int t;
    cin>>t;
    while(t--){
        ll n,x;
        cin>>n>>x;
        ll sum = 0;
        vector<ll> ans(n,0);
        for(int i = 0;i<n;i++){
            ans[i] = i + 1;
            sum += i + 1;
        }
        if(sum>x){
            cout<<-1<<endl;
        }else{
            ans[n-1] += x - sum;
            for(int j = 0;j<n;j++){
                if(j) cout<<" ";
                cout<<ans[j];
            }
            cout<<endl;
        }
    }
}