#include <bits/stdc++.h>

typedef long long int ll;
typedef unsigned long long int ull;
typedef long double ld;

#define mp make_pair
#define pb push_back
#define bp __builtin_popcount

#define mt(a,b,c) mp(a,mp(b,c))

const ll mo=1e9+7;
const ll INF=1e9;
const ld pi=acos(-1);
const int mxn=1e4+5;
const int cons=1;

using namespace std;

int main()
{
    //freopen("input.txt","r",stdin);
    ios_base::sync_with_stdio(false);
    cin.tie(NULL);
    ll q,l,c,n,a,temp,i,ad;
    cin>>q;
    while(q--)
    {
        cin>>n>>c;
        a=-1;
        l=0;
        while(2*l<=n)
        {
            temp=( (n-2*l)*(n-2*l-1) )/2;
            if(temp==c)
            {
                a=l;
                break;
            }
            else if(temp<c)
            {
                break;
            }
            else
            {
                c-=(n-2*l-1);
            }
            l++;
        }
        if(a==-1)
        {
            cout<<"-1\n";
        }
        else
        {
            for(i=1;i<=a;i++)
            {
                cout<<2*i<<" ";
            }
            ad=1;
            for(i=a+1;i<=n-a;i++)
            {
                cout<<2*a+ad<<" ";
                ad++;
            }
            for(i=n-a+1;i<=n;i++)
            {
                cout<<(n-i)*2+1<<" ";
            }
        }
        cout<<"\n";
    }
    return 0;
}