#include <bits/stdc++.h>

using namespace std;
void printArray(int i, int len){
    cout << i << " ";
    for(int j = 1; j <= len; j++){
        if(j != i){
            cout << j << " ";
        }
    }
    cout << endl;
}

int main(){
    int q;
    cin >> q;
    for(int a0 = 0; a0 < q; a0++){
        int len;
        int c;
        cin >> len >> c;
        // your code goes here
        
        int k = (len/2+1);
        int i;
        for(i = 1; i <= k; i++){
            int cmp = 0;
            int low = i-1, high = i+1;
            while(low > 0){
                cmp += low;
                low--;
            }
            while(high <= len){
                cmp += len - high + 1;
                high++;
            }
            if(cmp == c){
                printArray(i, len);
                break;
            }
        }
        if(i == k+1){
            cout << "-1\n";
        }
    }
    return 0;
}