#include <bits/stdc++.h>

using namespace std;

int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c;
        if(c>=2*len)
            cout<<-1<<endl;
        else if(c==0)
            cout<<1<<endl;
        else{
             //srand(time(NULL));
            cout <<  rand() % 10 + 1;
            while(len--){
            //srand(time(NULL));
            cout <<" "<<rand() % 10 + 1;
            }
            cout<<endl;
        }
    }
    return 0;
}