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ionic compounds. The experimental data on the high stability of particular topolog-
ical motifs of cation arrays could be a reliable background for ab initio modeling of
new inorganic substances and materials.
Acknowledgments This work was partially supported by a Cariplo Fellowship issued by Cariplo
Foundation & Landau Network, Centro Volta (Como, Italy). The author thanks Prof. D.M.
Proserpio for fruitful discussions of the periodic-graph problems and Dr. A. Vegas for thorough
reading of the manuscript and useful comments.
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