#include<bits/stdc++.h>
using namespace std;
using ll = long long;
#define rep(i,a) for(int i = 0; i < (a); ++i)

template<typename T> bool chmax(T &a,T b){if(a<b){a=b; return true;} return false;}
template<typename T> bool chmin(T &a,T b){if(a>b){a=b; return true;} return false;}

int main(){
    ios::sync_with_stdio(false);
    cin.tie(nullptr);

    int t;
    cin >> t;
    for(;t--;){
        int n,x;
        cin >> n >> x;
        int sum = (1+n)*n/2;
        if(sum>x) cout << -1 << endl;
        else {
            for(int i=0;i<n;++i){
                if(i!=n-1)cout << i+1 << " ";
                else cout << i+x-sum+1 << endl;
            }
        }
    }
}