11021
ROBERTS Her second - graders were very interested in sending some letters out to the troops .
 Her, Her second - graders, the troops
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 Her, Her second - graders, the troops