#include<bits/stdc++.h>
#define pi                  acos(-1)
#define READ                freopen("in.txt", "r", stdin)
#define WRITE               freopen("out.txt", "w", stdout)
#define INF                 1000000000
#define dist(ax,ay,bx,by)   sqrt((ax-bx)*(ax-bx)+(ay-by)*(ay-by))
#define M                   1000000
#define gcd(a,b)            __gcd(a,b)
#define lcm(a,b)            (a*b)/__gcd(a,b)
#define m_p(a,b)            make_pair(a,b)

using namespace std;
typedef unsigned long long llu;
typedef long long lli;


int main()
{
    lli q;
    scanf("%lli", &q);
    for(lli i=0; i<q; i++)
    {
        lli n, c;
        scanf("%lli %lli", &n, &c);

        lli rng= n*(n+1)/2;

        if(c>rng) cout<<"-1"<<endl;
        else if(n==1)
        {
            if(c==0) cout<<"1"<<endl;
            else printf("-1\n");
        }
        else
        {
            if(c==rng)
            {
                for(lli i=n; i>=1; i--) printf("%lli ",i );
                cout<<endl;
            }

            else if(c<(n*ceil(log10(n)))) cout<<"-1"<<endl;



        }
    }


    return 0;
}