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<li> General rule, maybe? When two adjectives both modify the same fairly non-specific noun, such as “one,” it is safe to elide the “one.” The SAT writers are insistent on having parallelism in comparisons where–for example–one might be comparing the paintings of Rembrandt to Van Gogh. This is incorrect, as written. Here, the paintings of Rembrandt are not intended to be compared to Van Gogh himself, but rather to his work. In my opinion, it would be correct to compare the paintings of Rembrandt to Van Gogh’s. In this case, you omit repetition of the word “painting,” but it is understood, and “Van Gogh’s” has the right form to modify it.</li>
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