QED Night
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The Four Platforms: Zara, Keiko, Jonas, and Mateo

Verified— unique solution
zebra
Four platforms stand in a row, numbered 1 to 4 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 traveler holding a rail pass is the traveler with the duffel bag. 2. The traveler holding a group fare is the traveler reading a newspaper. 3. The traveler holding a rail pass is immediately to the right of the traveler reading a manual. 4. The traveler reading a manual is Mateo. 5. The traveler reading a comic is Jonas. 6. The traveler with the backpack is Mateo. 7. The traveler with the satchel is Keiko. 8. Keiko is somewhere to the left of the traveler reading a guidebook. 9. The traveler reading a manual is somewhere to the left of the traveler reading a comic. 10. The traveler holding a day-return ticket is the traveler reading a comic.

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 platform (1–4) does “Keiko” end up at? Answer with the number.

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