2. 
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3. 
, 
4. 
5. 
, 
,
6. 
, 
7. 
. 
,
8. 
. 
,
9. . 
,
10. . 
,
11. . 
,
12. : 
13. . 
,
14. 
15. ,
16. 
. f 1, ,
,
17. . f 2, ,
,
18. . f 3, ,
19. . f 4, ,
,
20. 
- . R
21. R 
22. R - " ", = {a, b, , d, e, f, g, h},
.
R1 - " "
{(a, d), (, ), (, f), (, g), (, h)}
23. R - " ", = {a, b, , d, e, f, g, h},
.
R2 - " "
{(b, g), (b, h), (, d), (, ), (, f)}
24. R - " ", = {a, b, , d, e, f, g, h},
.
R3 - " "
{(b, ), (, b), (d, ), (, d), (d, f), (f, d), (e, f), (f, ), (g, h), (h, g)}
25. 
= 
26. R - " ", = {a, b, , d, e, f, g, h},
|
|
|
.
R4 - " "
{(g, b), (h, b), (d, c), (e, ), (f, )}
27. .
.
28. R X X,
