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Let `f, g and h` are differentiable functions. If `f(0) = 1; g(0) = 2; h(0) = 3` and the derivatives of theirpair wise products at `x=0` are `(fg)'(0)=6;(g h)' (0) = 4 and (h f)' (0)=5` then compute the value of `(fgh)'(0)`.

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