.
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. .
() 15 :
- , , 1: aaaa;
- - 3: aabb, abab, abba;
- ( ) - 4: aaab, aaba, abaa, baaa;
- - 6: aabc, abac, baac, abca, baca, bcaa;
- 1: abcd.
, : 4 , , ( ).
, (
abab,
abca ..).
: .
, 1.________________________________________
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