236749
It is however sometimes taught as a self-defense and pain compliance technique , for instance in Hapkido , Chin Na , Kenpo , jujutsu , Krav Maga , Vale Tudo and especially in ' Small Circle JuJitsu ' .
 None
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 None