#include <bits/stdc++.h>

using namespace std;
int summation(int n){
    int sum=0;
    for (int i=1;i<=n;i++)
        sum+=i;
    return sum;
}

int count(int n,int c){
    int level;
    
    int tem=n*(n-1)/2;
    for (level=1;level<n;level++){
        if (summation(level)==(tem-c))
            break;
    }
    //cout << level<<endl;
    for (int i=n;i>=1;i--){
        if (i==n-level+1){
            cout << i-1<<' ';
            continue;
        }
        if(i==n-level){
            cout << i+1<<' ';
            continue;
        }
        cout << i<<' ';
    }
    cout <<endl;
    return 0;
}

int main(){
    int q;
    cin >> q;
    while(q--) {
        int n,c;
        cin >> n>>c;
        if (n==1 && c==0){
            cout << "1"<<endl;
            continue;
        }
        if (c>(n*(n-1)/2)){
            cout <<"-1"<<endl;
            continue;
        }
        if (c==(n*(n-1)/2)){
            for (int i=1;i<=n;i++)
            cout << i <<' ';
            cout <<endl;
            continue;
        }
        if (c<n-1){
            cout << "-1"<<endl;
            continue;
        }
        count(n,c);
    }
    return 0;
}