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. Author manuscript; available in PMC: 2015 Dec 15.
Published in final edited form as: J Comput Chem. 2014 Oct 18;35(32):2305–2318. doi: 10.1002/jcc.23753 
for molecule in world:
    for lipid in molecule:
        for residue in lipid:
              for atom in residue:
                  do_something(atom)