#include <bits/stdc++.h>

using namespace std;/*
int solve(int rem, int n, int left)
{
    if(rem == 0) return 1;
    if(rem < 0) return 0;
    for(int i = 0; i < left, i++)
        solve(rem - left, n, left + i);
}*/
int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c;
        if(len == 1){
            if(c == 0) {
                cout << 1 << "\n";
            }
            else {
                cout << "-1\n";
            }
        }
        if(len == 2) {
            if(c == 0 || c > 1) {
                cout << "-1\n";
            }
            else {
                cout << "1 2\n";
            }
        }
        // your code goes here
    }
    return 0;
}