#include <bits/stdc++.h>
#include<string.h>
#define MOD 1000000007
#define MAXA 10000000000000ll
#define PI 3.14159265358979323846264338327950
#define INF 0x3f3f3f3f
typedef long long int ll;
using namespace std;
const ll maxa= 10000000000000ll;
const  int maxn=2e5+5;
const int N=1e6;
bool vis[maxn];
int main()
{
    //freopen("input.txt","r+",stdin);
    //freopen("output.txt","w+",stdout);
    ll t,n,m,i;
    cin>>t;
    while(t--)
    {
        cin>>n>>m;
        memset(vis,false,sizeof(vis));
        if(m>n*(n+1)/2)
        {
            printf("-1\n");
            continue;
        }
        ll temp=sqrt(4*m+1-n*n);
        if(temp*temp!=(4*m+1-n*n))
        {
            printf("-1\n");
            continue;
        }
        ll n1=n-1+temp;
        ll n2=n-1-temp;
        n1/=2;
        n2/=2;
        ll x=min(n1,n2);
        ll y=max(n1,n2);
        cout<<n-x<<" ";
        vis[n-x]=true;
        for(i=1;i<=n;i++)
        {
            if(!vis[i])
                printf("%lld ",i);
        }
        printf("\n");
    }
    return 0;
}