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The correct order of the sentences is f, c, a, d, e and b . Here, f provides the introduction. So, it is the first sentence of the passage. Since d is fixed, e and b come after d and c and a come before d . Out of c and a, c comes first because in a , ‘that checkpoint’ is mentioned, which is the 15 years mentioned in c . After d , e comes. In b , ‘this orbital thermal cycling’ is mentioned, which refers to what is mentioned in e . so, b is the last sentence of the passage.