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Originally planned as the second crewed Apollo Lunar Module and command module test , to be flown in an elliptical medium Earth orbit in early 1969 , the mission profile was changed in August 1968 to a more ambitious command-module-only lunar orbital flight to be flown in December , as the lunar module was not yet ready to make its first flight .
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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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