#include <iostream>
#include <cmath>
#include <string>


using namespace std;

int main(){

    int t; cin>>t;
    while(t>0){t--;
        long long n,s; cin>>n>>s;
        if(n>s)cout<<1<<" "<<s-1<<endl;
        else if(n*(n+1)/2<s)cout<<-1<<endl;
        else if(n<=s){
            long long sum=0;
            for(int i=(n+1)/2; i>0; i--){
                if(sum==s)break;
                sum+=i;
                cout<<i<<" ";
            }cout<<endl;
        }
    }

    return 0;
}