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The rovers ' landing sites , on opposite sides of the planet , were chosen for their likelihood of holding evidence of water .
 The rovers, The rovers ' landing sites, opposite sides of the planet, the planet, their
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 rovers, The rovers ' landing sites, opposite sides of the planet, the planet, their