, . , . 2 :
( , .);
. ( , .)
: 1) .. . : .
2) .
3) .. -.
( . "modus" , ) . :
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, , , , , .
3 :
1) : , ,
2) 2 : (: ) (: ).
3) : , .
22. .
, , , .
I) -, .
1) => ( S P => S P) ( . )
2) => ( S P => S P) ( => )
3) => ( S P => S ) ( = > )
4) => ( S => S ) ( => .)
II) , . ( => ) 2 : ; . S . S , . ( => ).
III) S, S - , . ( . : , .)