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Continue to ChatThe rocks, to a great extent, look swept clean. It's a much cleaner surface than what we had a right to hope for. - Steven Squyres from https://whatsmyquote.com/quote/the-rocks-to-a-great-extent-look-swept-clean-it-s-a-much-cleaner-surface-than-what-we-had-a-right-to-hope-for-1