1-

:

,

:

,

,

10-1= 10+2= 11+1= 12-1=

13+2= 13-1= 14-2= 15-1=

16+1= 17-2= 13+3= 18+1=

, .

.

,

. 1 .

?

- = ?

31?

.

15 .

101720189

.
.

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11.5.4

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Second level

Third level

Fourth level

Fifth level

11.5.4