25950
A number of times they detected neutrons in one , sometimes two , of the three detectors , but only once during 411 hours of the experiment did they detect a neutron burst in all three detectors -- and they think that was a spurious event .
 one, two, three, 411 hours, all three
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: date, organization, person, geographical social political, national religious political, facility, cardinal, location, work of art, law, event, product, ordinal, percent, time, quantity, money, language 
Text: {0} 
Answer:
 one, two, three, 411 hours, all three