100622
proved that in fact countably many 3-regular graphs with the desired property exist ; for instance , the Frucht graph , a 3-regular graph with 12 vertices and 18 edges , has no nontrivial symmetries , providing a realization of this type for the trivial group .
 Frucht
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Frucht