#include <bits/stdc++.h>

using namespace std;
void fc(long int len,long int z){long int i;
    if(z==0){
        for(i=0;i<len;i++)cout<<len-i<<" ";return;
            }
    else {
        if(z>=len-1){fc(len-1,z-len+1);cout<<len<<" ";return;}
        else {
            for(i=0;i<z;i++)cout<<len-i-1<<" ";
            cout<<len<<" ";i++;
            for(;i<len;i++)cout<<len-i<<" ";return;
        }
    }
}

int main(){
    int q;
    long int len,c,x,y,z,i,j; 
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        cin >> len >> c;
        // your code goes here
        if(len==1){if(c==0)cout<<"1 ";}
        else {y=(len*(len-1))/2;
        x=y/2+1;
        if(c<x||c>y)cout<<"-1";
        else {
 //           z=y-c;
            fc(len,c);
            
        }}
       cout<<'\n'; 
    }
    return 0;
}