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The error in this sentence and the corresponding Redbook rule to help you identify the error:
If the parties had agreed upon a specified method of making the determination, they could have used whatever rent figure emerged.
What is a buried verb or nominalization and Redbook rule 10.43. (Correct: "If the parties had determined an agreed-upon method for calculating the rent, they could have used whatever figure emerged.") There are actually many different ways to rewrite this sentence that will "unbury" the verb. The point is to recognize the nominalization and correct it.