Nido-6(V) versus nido-6-(IV) configurations for the known species, C2B4H62- and N2B4H6 and some calculated analogs, B6H64-, CB5H63-, NB5H62-, SB5H52-, OB5H52-, NCB4H61-, SCB4H5'-, OCB,H51-, SNB4H5, ONB4H5, S2B4H4, OSB4H, and 02B4H4
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