Step 1:
The complex $\mathrm{KFe}\left[\mathrm{Fe}(\mathrm{CN})_{6}\right]$ is formed from $\mathrm{K}^{+}$, $\mathrm{Fe}^{3+}$ and $\mathrm{Fe(CN)}_{6}^{3-}$ as shown in the equation:
\[\mathrm{K}^{+} + \mathrm{Fe}^{3+} + \mathrm{Fe(CN)}_{6}^{3-} \rightarrow
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