Using the 18-electron rule per metal, the total number of metal-metal bonds in one molecule each of $\mathrm{Mn}{}_2(\mathrm{CO}){}_{10}$, $\mathrm{Fe}{}_2(\mathrm{CO}){}_9$, $\mathrm{Co}{}_2(\mathrm{CO}){}_8$ and $\mathrm{Fe}{}_3(\mathrm{CO}){}_{12}$ is:

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