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The 1979 IUPAC nomenclature rules made an exception for retaining the non-systematic name " ethylene " ; however , this decision was reversed in the 1993 rules , and it remains unchanged in the newest 2013 recommendations , so the IUPAC name is now " ethene " .
 IUPAC, IUPAC
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
 IUPAC, IUPAC