#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==0)&&(len==1))
            {
            cout<<1<<"\n";
            continue;
            
        }
        if((len==3)&&(c==2))
            {
            cout<<2<<" "<<1<<" "<<3<<"\n";
            continue;
        }
        
        
        
        
        
        
        
        
        
        
        if(len%2==0)
            {
            if(c==(len+2))
                for(int i=len;i>=1;i--)
            {  cout<<i<<" ";
            }
            else
                cout<<-1;
            cout<<"\n";
            
        }
        else
            { int a[len];
            if(c==(len+1))
                { int x=(len-1)/2;
                  a[x]=1;
                int val=1;
                 int left=x-1;
                 int right=x+1;
                for(int i=2;i<=len;i++)
                {
                    if(val%2!=0)
                        {
                        a[left]=i;
                        left--;
                        val++;
                    }
                    else
                        {
                        a[right]=i;
                        right++;
                        val++;
                    }
                    
                }
                for(int i=0;i<len;i++)
                    cout<<a[i]<<" ";
            }
            else
                cout<<-1;
            cout<<"\n";
            
            
            
            
        }
        
        
        
        
        
        
        
        
        
    }
    return 0;
}