#include <iostream>
#include <algorithm>

using namespace std;

int main(){
    ios::sync_with_stdio(false);
    int q;cin>>q;
    while(q--){
        int len,c;cin>>len>>c;
        long long max = len*(len-1)/2;
        long long min = (len-1)*(len-2)/2;
        if(c>min||c<min)cout<<-1;
        else{
            int n = len;
            int arr[n];
            for(int i=0;i<n;++i)arr[i] = n-i;
            long long gap = max-c;
            int allowed = n-2;
            while(gap){
                if(gap>allowed){
                    swap(arr[n-2-allowed],arr[n-2-allowed+1]);
                    gap-=allowed;
                    --allowed;
                }
                else{
                    swap(arr[n-2-gap],arr[n-2-gap+1]);
                    break;
                }
            }
            for(int i=0;i<n;++i)cout<<arr[i]<<" ";
        }
        cout<<endl;
    }
}