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the mars express on its way on a seven - month journey to the red planet , contains really two spacecraft .
 the mars express, its, two spacecraft, the red planet
Please list all entity words in the text that fit the category. Output format is "word1, word2". 
Option: organization, person, geographical social political, vehicle, location, weapon, facility 
Text: {0} 
Answer:
 the mars express, its, two spacecraft, the red planet