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virtual OEAtomBase *GetNbr(const OEAtomBase *src) const
Return the atom across the bond from the specified atom. If the ``src''
argument represents the begin atom of the bond,
i.e. OEBondBase::GetBgn, this method returns the end atom,
i.e. OEBondBase::GetEnd, and if the ``src'' argument is the end
atom, this function returns the begin atom. If passed an atom other
than the begin or end atoms, this function returns a NULL pointer,
(OEAtomBase*)0. This function is often used for traversing the
atoms of a molecule.
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