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The rover known as Spirit was launched.
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The rover known as Opportunity was launched.
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The rover named Spirit landed on the surface of Mars.
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The rover named Opportunity landed on the surface of Mars.
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The rover named Opportunity went into Crater Victoria.
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The rover named Opportunity came out of Crater Victoria.
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The rover named Spirit was driving along and got stuck in soil.
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The rover named Spirit stopped transmitting to Earth.
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NASA decided that the rover named Spirit would stay stationary.
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The rover named Opportunity went through a crater field carefully.
