                  
                     .

	       
   -     .
	        :

--------------------------
| .(..)..   |
| ..(..)..   |
|...........(,,)..   |
--------------------------

F1  F2/+  F10 

	       .
    ,    
       
.  ""     
      ,    
 .     . 
     "-" (: -,101,102), 
         
 "".

	   F2,    :

---------------------------
|  . |
|  .    |
|                    |
---------------------------

	   "  ",  
 ,         
   .
	       
      
,    .