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Rebel fighters and Russian soldiers said a ceasefire effective at noon ( 0800 GMT ) on Friday was being generally observed , although scattered gunfire echoed through the Chechen capital Grozny .
 GMT, Russian, Grozny, Chechen
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, else, organization, person 
Text: {0} 
Answer:
 GMT, Russian, Grozny, Chechen