#include <bits/stdc++.h>

#define fs first
#define sc second
#define mp make_pair
#define pp push_back

typedef long long ll;

using namespace std;

int main(){
	int n;
	scanf("%d", &n);
	while(n--){
		int l, c;
		scanf("%d %d", &l, &c);
		int foo = (l * (l-1)) / 2;
		if(foo > c || foo/2 + 1 > c){
			puts("-1");
		}else{
			//
			// l + l * (l-2) / 2
			for (int i = 1; i <= l; ++i)
			{
				printf("%d ", i);
			}
			printf("\n");
		}
	}
	return 0;
}