2720
the knowledge that our lights are the first to light it up , our footprints were the first , our eyes were first first to see it .
 our, our, our
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: geographical social political, organization, person, location, facility, vehicle, weapon 
Text: {0} 
Answer:
 our, our, our