#include<bits/stdc++.h>
using namespace std;
#define int long long

signed main(){
	int T;
	cin >> T;
	for(int j=0;j<T;j++){
		int N,X;
		cin >> N >> X;
		//1,2,3,4,...,Nよりでかく
		int sum=(N+1)*N/2;
		if(sum>X){
			cout << -1 << endl;
			continue;
		}
		for(int i=1;i<N;i++){
			cout << i << " ";
		}
		cout << N+X-sum << endl;
	}
}