#include <bits/stdc++.h>

using namespace std;

long long get_max(int l) {
    long long result = l-1;
    int a=l-1;
    while(a>0) {
        a--;
        result+=a;
    }
    return result;
}

int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c;
        // your code goes here
        long long max = get_max(len);
        if(c > max) {
            cout << "-1" << endl;
            continue;
        } else if(len == 1 && c > 0) {
            cout << "-1" << endl;
            continue;
        } else if(c == max) {
            for(int i=len;i>0;i--) {
                cout << i << " ";
            }
            cout << endl;
            continue;
        } else if (c<len-1) {
            cout << "-1" << endl;
            continue;
        }
        
        
    }
    return 0;
}