#include <bits/stdc++.h> using namespace std; using ll = long long; const ll linf=(1LL<<60) - 1; const int inf=(1LL<<30) - 1; const int mod=1000000007; const int MOD=998244353; const ll dx[] = {1, 0, -1, 0, 1, 1, -1, -1}; const ll dy[] = {0, 1, 0, -1, 1, -1, 1, -1}; #define overload4(a,b,c,d,name,...) name #define rep1(n) for(long long _=0;_<n;++_) #define rep2(i,n) for(long long i=0;i<n;++i) #define rep3(i,a,b) for(long long i=a;i<b;++i) #define rep4(i,a,b,c) for(long long i=a;i<b;i+=c) #define rep(...) overload4(__VA_ARGS__,rep4,rep3,rep2,rep1)(__VA_ARGS__) #define all(x) (x).begin(), (x).end() #define rall(x) (x).rbegin(), (x).rend() #define vec(type,name,...) vector<type> name(__VA_ARGS__) #define vv(type,name,h,...) vector name(h,vector<type>(__VA_ARGS__)) #define vvv(type,name,h,w,...) vector name(h,vector(w,vector<type>(__VA_ARGS__))) #define vvvv(type, name, h, w, n, ...) vector<vector<vector<vector<type>>>> name(h, vector<vector<vector<type>>>(w, vector<vector<type>>(n, vector<type>(__VA_ARGS__)))) struct Setting{ Setting(){ cin.tie(nullptr)->sync_with_stdio(0); fixed(cout).precision(12); } }Setting; // #define _GLIBCXX_DEBUG //----------------------------------- void solve() { ll N, X; cin >> N >> X; ll t = N * (N-1) / 2; if(X - t < N){ cout << -1 << endl; }else{ for(int i=0;i<N-1;i++){ if(!i) cout << i+1; else cout << " " << i+1; } cout << " " << X - t << endl; } } int main() { int T = 1; cin >> T; while(T--) solve(); }