public function not()
 {
     $eq = new Equals($this->value);
     $gt = new GreaterThan($this->value);
     return $eq->lOr($gt);
 }
 public function not()
 {
     $eq = new Equals($this->value);
     $lt = new LesserThan($this->value);
     return $eq->lOr($lt);
 }