person::operator= (const Person & P) const{
  return ((areanumber > P.areanumber) or
	  ((areanumber == P.areanumber) and
	   (number > P.number)) or
	  ((areanumber == P.areanumber) and
	   (number == P.number) and
	   (familyname > P.familyname)) or
	  ((areanumber == P.areanumber) and
	   (number == P.number) and
	   (familyname == P.familyname) and
	   (name > P.name)));
}