233
Although Grice ' s operation has been used all over the world , no systematic account of it has been found in the literature ( including publications dealing with technique ) , which presents it in terms related to the basic " classical " principles on which the operation was conceived .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: GENE 
Text: {0} 
Answer:
 None