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The correct way to rewrite the pronoun is this:
When using a pronoun, be sure to only attach the pronoun in places where the antecedents are clearly stated. It is wrong to use a pronoun without specifically mentioning the antecedent. This will make a reader become confused about the specific item being referred to.
In the sentence above, the use of the relative pronoun "which" is wrong in this sentence because it does not clearly state what is expensive. However, the corrected part clearly shows that it is the operation of the Pony Express that is expensive.
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