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find the number of elements which arae iosfiaphers of `""_(89_Ac^(227)` An element is respresented as (A.Z) (231,91),(223,87),(227,90),(223,88_),(219,

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find the number of elements which arae iosfiaphers of `""_(89_Ac^(227)` An element is respresented as (A.Z)
(231,91),(223,87),(227,90),(223,88_),(219,85),(215,83),(215,84),(207,82),(211,83),
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`A-2Z "of" ""_(89)Ac^(227)=49,(231,91)(223,87),(219,85),(215,83)`
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