#include using namespace std; template using min_priority_queue = priority_queue,greater>; template void printv(vector &v){ bool b = false; for(auto i : v){ if(b) cout << " "; else b = true; cout << i; } cout << endl; } template bool chmin(T &a, const T& b) { if (a > b) { a = b; // aをbで更新 return true; } return false; } template bool chmax(T &a, const T& b) { if (a < b) { a = b; // aをbで更新 return true; } return false; } void yn(bool b){ if(b) cout << "Yes" << endl; else cout << "No" << endl; } bool debug; bool randomInput; void input(){ if(debug && randomInput){ } else{ } return; } void calc(){ int T; cin >> T; for(int i = 0; i < T; i++){ int N; int64_t X; cin >> N >> X; if((int64_t)N*(N+1)/2 > X){ cout << -1 << endl; continue; } vector ans(N); for(int j = 0; j < N; j++){ ans[j] = j+1; } ans[N-1] += X - (int64_t)N*(N+1)/2; for(int j = 0; j < N; j++){ if(j) cout << " "; cout << ans[j]; } cout << endl; } return; } int64_t ansSimple; void calcSimple(){ return; } void calc1(){ int t; cin >> t; for(int i = 0; i < t; i++){ input(); calc(); calcSimple(); } } int main(){ debug = 0; randomInput = 0; srand(time(NULL)); cout << fixed << setprecision(12); if(debug){ calc1(); } else{ input(); calc(); } return 0; } //