32848
" Arithmetic " ( from the Greek ἀριθμός " arithmos " , ' number ' and τική [ τέχνη ] , " tiké [ téchne ] " , ' art ' ) is a branch of mathematics that consists of the study of numbers , especially the properties of the traditional operations on them - addition , subtraction , multiplication , division , exponentiation and extraction of roots .
 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