350559
From the 4000-series onwards , the PAM-D received the upper stage code " 5 " , however this was not applied retrospectively to 3000-series rockets , which were still in service at the time .
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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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