#include <bits/stdc++.h>

using namespace std;

int main(){
    int q;
    scanf("%d",&q);
    
    while(q--)
        {
        int len,c;
        scanf("%d%d",&len,&c);
        if(len*len <= c)
            printf("-1");
        else
            {
            int a[len],i;
            for(i=0;i<len;i++)
              a[i] = i+1;
            
              i=0;
            while(i<=c)
                {
                int z;
                z = a[i];
                a[i] = a[i+1];
                a[i+1] = z;
                i++;
            }
            for(i=0;i<len;i++)
                {
                if(a[i] == 0)
                    a[i] = 1;
                printf("%d ",a[i]);
            }
        }
        printf("\n");
    }
   
    return 0;
}