/*
 Problem name :
 Algorithm : Not Sure Yet
 Contest/Practice :
 Source :
 Comment : Whenever you start to believe  yourself, people also start to believe in you
 Date : --
 Last Update : 25-Mar-2015
*/

#include<bits/stdc++.h>

#define pause           system("pause");
#define FOR(s,e,inc)    for(int i=s;i<=e;i+=inc)
#define mod             1000000007
#define inf             1<<30
#define pb              push_back
#define ppb             pop_back
#define mp              make_pair
#define F               first
#define S               second
#define sz(x)           ((int)x.size())
#define sqr(x)          ( (x)* (x) )
#define eps             1e-9
#define lcm(x,y)        (abs(x) /gcd(x,y))* abs(y)
#define on(x,w)         x|(1<<w)
#define check(x,w)      (x&(1<<w))
#define all(x)          (x).begin(),(x).end()
#define pf              printf
#define sf              scanf
#define pi              acos(-1.0)
#define reset(x,v)      memset(x,v,sizeof(x));
#define AND             &&
#define OR              ||
#define what_is(x)      cerr<<#x<<" is "<<x<<"\n";

typedef long long ll;
typedef unsigned long long llu;

using namespace std;


template<class T>
inline T mod_v(T num)
{
    if(num>=0)
        return num%mod;
    else
        return (num%mod+mod)%mod;
}
template<class T>
inline T gcd(T a,T b)
{
    a=abs(a);
    b=abs(b);

    while(b) b ^= a ^= b ^= a %= b;
    return a; 
}

template<class T>
T fast_pow(T n , T p)
{
    if(p==0) return 1;
    if(p%2)
    {
        T g=mod_v ( mod_v(n) * mod_v(fast_pow(n,p-1)) );
        return g;
    }
    else
    {
        T g=fast_pow(n,p/2);
        g=mod_v( mod_v(g) * mod_v(g) ) ;
        return g;
    }
}

template<class T>
inline T modInverse(T n)
{
    return fast_pow(n,mod-2);
}

bool equalTo ( double a, double b ){ if ( fabs ( a - b ) <= eps ) return true; else return false; }
bool notEqual ( double a, double b ){if ( fabs ( a - b ) > eps ) return true; else return false; }
bool lessThan ( double a, double b ){ if ( a + eps < b ) return true; else return false; }
bool lessThanEqual ( double a, double b ){if ( a < b + eps ) return true;   else return false;}
bool greaterThan ( double a, double b ){if ( a > b + eps ) return true;else return false;}
bool greaterThanEqual ( double a, double b ){if ( a + eps > b ) return true;else return false;}


template<class T>
inline int in(register T& num)
{
    register char c=0;
    num=0;
    bool n=false;
    while(c<33)c=getchar();
    while(c>33){
        if(c=='-')
            n=true;
        else num=num*10+c-'0';
        c=getchar();
    }
    num=n?-num:num;
    return 1;
}

/******* ! Code start from here ! *******/


int main()
{
//     std::ios_base::sync_with_stdio(false);

 

    int q;

    in(q);

    while(q--){
        ll a,b;

        in(a),in(b);

        ll mn=0;

        for(int i=1;i<a;i+=2)
            mn+=i;

        ll s=(a*(a-1) )/2;
       // pf("%lld %lld %lld\n",s,mn,b);
        if(s<b || mn>b)
            pf("-1\n");
        else{
            vector<int>res;  

            int n=a;
            a=b;
            b=s;
            for(int i=n;i>=1;){
                //pf("%lld %lld %d\n",a,b,i);
                if(b>a){
                    if(i==1)
                     break;   
                    else{
                        res.pb(i-1);
                        res.pb(i);
                        b-=(i-2);
                        b-=(i-1);
                        a-=(i-1);
                        i-=2;

                    } 

                }
                else{
                    res.pb(i);
                    i--;
                    b-=i,a-=i;
                } 
            }

            if(!a)
                for(int i=0;i<sz(res);i++)
                pf("%d ",res[i]);
            else pf("-1");
            pf("\n");
        } 
    }


    return 0;
}