///gnc
#include <iostream>
#include <fstream>
#include <vector>

using namespace std;
bool regionintersects(int a1, int a2, int b1, int b2)
{
  return !(a2<b1 || b2<a1 ) ;//(a1<=b1 && b1<=a2 ) || (a1<=b2 && b2<=a2 );
}
struct Rectr
{
  int x1, y1, x2, y2;
  int color; // -1:transparent
  Rectr(int a,int b,int c,int d) : x1(a),y1(b),x2(c),y2(d),color(-1)
    {}
  bool intersects(const Rectr &r2) const
    {
      return regionintersects(x1, x2, r2.x1, r2.x2) && regionintersects(y1, y2, r2.y1, r2.y2);
    }
};

int main(void)
{
  int nc;
  ifstream in("rect.txt");
  in>>nc;
  while ( nc-- > 0 ) {
    int nrects;
    int i, j, k;
    in>>nrects;
    vector<Rectr> vr;
    for ( i=0 ; i<nrects ; i++ ) {
      int x1, y1, x2, y2;
      in >> x1>>y1>>x2>>y2;
      vr.push_back(Rectr(x1, y1, x2, y2));
    }
    
    int colors = 0;
    for(;;) {
      for ( i=0 ; i<nrects && vr[i].color>=0 ; i++ ) ;
      if ( i==nrects ) break;
      vr[i].color = ++colors;
      int ends=0;
      while ( ends==0 ) {
        ends=1;
        for ( i=0 ; i<nrects ; i++ ) {
          if (vr[i].color>=0 ) continue;
          for ( j=0 ; j<nrects ; j++ ) {
            if ( i==j || vr[j].color<0 ) continue;
            if ( vr[i].intersects(vr[j]) ) {
              vr[i].color=vr[j].color;
              ends=0;
            }
          }
        }
      }
    }

    cout<<colors<<endl;
  }
  return 0;
}