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These included a helium gas accumulator installed in the liquid oxygen ( LOX ) line of the center engine , a backup cutoff device for that engine , and a simplified 2-position propellant utilization valve on each of the five J-2 engines .
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Please list all entity words in the text that fit the category.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
Answer:
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