#include <bits/stdc++.h>
using namespace std;
#define ll long long
int main()
{
	int t;
	cin>>t;
	while(t--)
	{
		ll n,c;
		cin>>n>>c;
		if (c>(n*(n-1)/2))
		{
			printf("-1 ");
		}
		else
		{
			if (c==(n*(n-1)/2))
			{
				for (ll i = 0; i < n; ++i)
				{
					printf("%lld ",i );
				}
			}
			else
			{
				ll k=((n*(n-1)/2))-c;
				for (ll i = k; i > 0; --i)
				{
					printf("%lld ",i );
				}
				for (ll i = k+1; i <= n; ++i)
				{
					printf("%lld ", i);
				}

			}
		}
		printf("\n");
	}

	return 0;
}