#include <bits/stdc++.h>
using namespace std;
#include <atcoder/all>
using namespace atcoder;
#define rep(i, n) for(int i=0;i<(n);++i)
#define rep1(i, n) for(int i=1;i<=(n);i++)
#define ll long long
using mint = modint998244353;
using P = pair<ll,ll>;
using lb = long double;
using T = tuple<ll, ll, ll>;
#ifdef LOCAL
#  include <debug_print.hpp>
#  define dbg(...) debug_print::multi_print(#__VA_ARGS__, __VA_ARGS__)
#else
#  define dbg(...) (static_cast<void>(0))
#endif

int main()
{
    int t;
    cin>>t;
    rep(_,t){
        int n, x;
        cin >> n >> x;
        ll sum = (ll)n*(n+1)/2;
        if(sum>x) {
            cout << -1 << endl;
            continue;
        } 
        int last = x - sum;
        rep(i,n-1) {
            cout <<i+1 << " ";
        }
        // dbg(last);
        cout << n + last << endl;
    }
    return 0;
}