. ӿ . (), ().
ӿ ǖ . , , : ( ; , , , ); ó ( , ), ( ), ( ) ( ). , ӿ, : ( ǖ) (Witkin, Dyk, Faterson, Goodenough, Karp, 1974).
, ǖ . . . ӿ , , . , , . . . , 㳿 (Witkin, Moore, Goodenough, 1977).
ǖ , . , , .
( -70 ) ( , , , , . .) [23].
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ǖ . , , . . . , , . ֳ . , (Witkin, Goodenough, 1977).
, , , ӿ, .
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