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Topologically ordered states have some amazing properties , such as ground state degeneracy that can not be lifted by any local perturbations but depends on the topology of space , quasiparticle fractional statistics and fractional charges , perfect conducting edge state s even in presence of magnetic impurities , topological entanglement entropy , etc. .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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