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A molecular orbital treatment can be used to rationalize the bonding of cluster compounds of the 4''n'', 5''n'', and 6''n'' types.
[[File:Re4CO122-.svg|thumb|The structure of the [[butterfly cluster compound]] [Re<sub>4</sub>(CO)<sub>12</sub>]<sup>2−</sup> conforms to the predictions of PSEPT.]]
===4''n'' rules===
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