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Utility functions for nanostructures.
Copyright Schrodinger, LLC. All rights reserved.
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 Return a set of symbols of atomic elements in the periodic table. 
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 Return a rotated vector of a given length. 
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 For a six-membered ring rotate the three double bonds, i.e. the first double bond will be moved from the atom pair (1, 2) to the atom pair (2, 3). 
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 Return the atom index obtained by applying an inversion operation to the given index in a given hexagon. 
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