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9- 2.
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,
1974 ., , .
, , V- . .
: . : . . .
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180 ( n 2)
123AnA4
, - .
, .
R
, - .
, .
r
, .
, , .
.
R
r
rR
a
rR
a
Rra
rRa1. a=3
2. R = 3
3. r = 3
rRa1.a = 4
2. R = 4
3. r = 4
Rra1. a = 1
2. R = 2
3. r = 3