83221
Therefore , the SO ( 3 ) , SO ( 4 ) and SO ( 3,1 ) groups cited above are not the full symmetry groups of their orbits ; the full groups are O ( 3 ) , O ( 4 ) and O ( 3,1 ) , respectively .
 O
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 O