#include <stdio.h>

int main() {
  int T;
  scanf("%d", &T);
  while (T-- > 0) {
    long long N, X;
    scanf("%lld %lld", &N, &X);
    if (N * (N + 1) / 2 > X) {
      printf("-1\n");
      continue;
    }
    for (int i = 1; i <= N - 1; ++i) {
      printf("%d ", i);
      X -= i;
    }
    printf("%lld\n", X);
  }
}