#include <bits/stdc++.h>

using namespace std;

int main()
{
    long long t,n,k,a[100005],i;
    cin>>t;
    while(t--)
    {
        cin>>n>>k;
        memset(a,0,sizeof(a));
        if(k>(n*(n-1))/2) {cout<<-1;continue;}
        for(i=n-1;i>=1;i--)
        if(k>=i) {a[i]=1;k-=i;}
        for(i=1;i<n;i++)
        if(a[i])
        cout<<i<<" ";
        for(i=1;i<=n;++i)
            if(!a[i]) cout<<i<<" ";
        cout<<endl;
    }
    return 0;
}