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If a, b, c are positive numbers such that `a^(log_(3)7) =27, b^(log_(7)11)=49, c^(log_(11)25)=sqrt(11)`, then the sum of digits of `S=a^((log_(3)7)^(2))+b^((log_(7)11)^(2))+c^((log_(11)25)^(2))` is :

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