C

#include <bits/stdc++.h>

using namespace std;

#define ll     long long
#define _test   int _TEST; cin>>_TEST; while(_TEST--)
#define pb     push_back

int main()
{
    _test
    {
        ll int n, k;
        cin>>n>>k;

        vector<ll int> v;
        for(int i=1; i<=n/2; i++)     v.pb(1);
        for(int i=1; i<=n/2; i++)     v.pb(2);

        ll int s = k - accumulate(v.begin(), v.end(), 0ll);

        if(s<0 || s%2==1)         cout<<-1<<"\n";
        else
        {
            for(auto &e: v)
            {
                ll int add = s;
                add = min(100000-e, add);
                add -= add%2;
                e += add;
                s -= add;
            }

            if(accumulate(v.begin(), v.end(), 0ll) != k)
                cout<<-1<<"\n";
            else
            {
                for(auto e: v)      cout<<e<<" ";
                cout<<"\n";
            }
        }
    }
}