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Piotr Grabowski told Reuters that a Mostostal extraordinary shareholders meeting on Saturday had decided that the price of the 250,000 bonds would be set as a 10-session average price of Mostostal shares plus a premium .
 Piotr Grabowski, Mostostal, Reuters, Mostostal
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:
 Piotr Grabowski, Mostostal, Reuters, Mostostal