 (  ) 
                    ϡ  ǐ          ϡ       .  ѐ     ϐ                 . 
               : 
          +           ϡ  ѐ           ϡ    ϐ         ϐ                     ʡ  ǐ       ϡ  ѡ    ϐ       ϡ                                      .        ?         X  . 
             ϡ                                       ʡ            ?        X     . 
            ϡ   ϡ     ѐ     ϡ   . 
                       ϡ    -  ϡ             Ͽ                   є            . 
              :     ѐ      (        )                                    (  )                          . 

