private void	CheckEuler( int V, int E, int F )
  {
    if ( check )
      System.out.print("Checks: V, E, F = "+V+", "+E+", "+F+"\n");
    
    if ( (V - E + F) != 2 )
      System.out.print(" Checks: V-E+F != 2\n");
    else if ( check )
      System.out.print(" V-E+F = 2\t\n");
    
    
    if ( F != (2 * V - 4) )
      System.out.print(" Checks: F=" +F+ " != 2V-4=" +(2*V-4)+ "; V=" +V);
    
    else if ( check ) 
      System.out.println ("F = 2V-4\t");
    
    if ( (2 * E) != (3 * F) )
      System.out.println(" Checks: 2E="+2*E+" != 3F="+3*F+"; E="+E+", F="+F);
    else if ( check ) 
      System.out.println(" 2E = 3F");
  }