 <?php
   class Vektor{
       private $x;
	   private $y;
       function __construct($ux, $uy){
	     $this->x=$ux;
		 $this->y=$uy;
	   }
	   function kysiX(){
	     return $this->x;
	   }
	   function kysiY(){
	     return $this->y;
	   }
	   function liida($teine){
	      return new Vektor($this->x+$teine->kysiX(), $this->y+$teine->kysiY());
	   }
	   function vastandVektor(){
	      return new Vektor(-$this->x, -$this->y);
	   }
   }
 ?>