3798
In the meantime , a disputed area in Southern Serbia ' s Presavo valley has reopened to traffic after Serb police and Albanian rebel fighters agreed to dismantle two roadblocks .
 Serb, Albanian, Serb police, Albanian rebel fighters, two roadblocks, a disputed area in Southern Serbia ' s Presavo valley, Southern Serbia, Southern Serbia ' s Presavo valley
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:
 Serb, Albanian, Serb police, Albanian rebel fighters, two roadblocks, a disputed area in Southern Serbia ' s Presavo valley, Southern Serbia, Southern Serbia ' s Presavo valley