#include<bits/stdc++.h>
using namespace std;
#define M 1000000007
#define f first
#define s second
#define pb push_back
#define ll long long
#define mp make_pair
#define r0 return 0
int mini(int a,int b){return a<b?a:b;}
ll lmini(ll a,ll b){return a<b?a:b;}
int maxi(int a,int b){return a>b?a:b;}
ll lmaxi(ll a,ll b){return a>b?a:b;}
int gcd(int a, int b){ if(b==0) return a; return gcd(b,a%b); }
ll lgcd(ll a, ll b){ if(b==0) return a; return gcd(b,a%b); }
int lcm(int a, int b) {return a*(b/gcd(a,b));}
ll llcm(ll a, ll b) {return a*(b/gcd(a,b));}
ll q,n,c,a;
/*void fun(vector<int> v,int n,int c){
    if((c<n-1||c>((n*(n-1))/2)){
            return;
        }
        int i,l;
        for(i=0;i<=n/2;i++){
            v.push_back(i,n-i);
            l=n-i;
            if(i!=0){
                fun(v,i,c-(l-1)-(i-1));
                fun(v,l,c-(l-1)-(i-1));
            }
            else{
                fun(v,n,c-(n-1));
            }
        }
        return;
}*/
int main(){
    cin>>q;
    while(q--){
        cin>>n>>c;
        a=1; int flag=0;
      //  while(1){
                if(n==1){
                    cout<<a<<endl;
                    break;
                }
                if(n<1){
                    break;
                }
        if(c<n-1||c>((n*(n-1))/2)&&flag==0){
            cout<<-1<<endl;
        }
        else{
                for(i=1;i<=n;i++){
                    cout<<i<<" ";
                }
                cout<<endl;
               /* flag=1;
            if(c==n-1){
                if(n==2||n==3){
                    if(n==2){
                        cout<<a+1<<" "<<a<<endl;
                    }
                    else{
                        cout<<a+2<<" "<<a+1<<" "<<a+3<<endl;
                    }
                }
                else{
                    cout<<-1<<endl;r0;
                }
            }
            if(c-(n-1)>=n-2){
                cout<<a<<" ";
                c-=n-1;n--;
                a++;
            }
            else{
                cout<<a+3<<" "<<a+1<<" "<<a+2<<" ";
                a+=4;
                c-=n-3;n-=3;
            }*/
        }
    }
    r0;
}