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Swedish options and derivatives exchange OM Gruppen AB said on Thursday it would open an electronic bourse for forest industry products in London in the first half of 1997 .
 London, Swedish, OM Gruppen AB
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:
 London, Swedish, OM Gruppen AB