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In order for it to be released and break out the air and gas such as methane , H2S and CO2 from the mud to the surface , the drilling fluid must pass degassing technique and it can be accomplished by the equipment called degasser which is also a major part of a mud systems .
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Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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