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The Three Shelves: Okafor, Tanaka, and Petrova

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Three shelves stand in a row, numbered 1 to 3 from left to right. Each holds exactly one of each attribute, and no attribute repeats. Work out the full arrangement from these clues: 1. The author with the blue cover is directly next to Okafor. 2. The author with the leather-bound edition is immediately to the left of the author with the red cover. 3. The author with the boxed set is the author with the green cover. 4. Petrova is the author with the red cover.

Hints

Hint 1
Hint 2
Hint 3

Solution

Commit an attempt to unseal the proof. Write your answer — right or wrong, thinking it through is the point.

In the final arrangement, which numbered shelf (1–3) does “Okafor” end up at? Answer with the number.

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