10477
With this understanding , he was able to construct a modification of the standard Ricci flow , called " Ricci flow with surgery " , which can systematically excise singular regions as they develop , in a controlled way .
 Ricci
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Ricci