37982
After 350,000 BP the more refined so-called Levallois technique was developed , a series of consecutive strikes , by which scrapers , slicers ( " racloirs " ) , needles , and flattened needles were made .
 Levallois
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Levallois