37792
Suppose we have a source that emits electron–positron pairs , with the electron sent to destination " A " , where there is an observer named Alice , and the positron sent to destination " B " , where there is an observer named Bob .
 Alice, Bob
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 Alice, Bob