- 9

"N" "R"
"N" "D" ()
"N" "R" "N" "D" ( ) , 2 , , , , .

      -   10


      (4 )
      (4 ) (4 ) ...


      1. . 2. , . 3. ...


      101. 102. 103. 104. 1. . 2 ...