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On six it takes you back to 4 floors with 2 elevators and the challenge is 40 people in under 60 elevator moves.

The first 5 are easy to "brute force" but six is making me think a bit more.



I cheated with #6. My elevators wait on the ground floor until they fill up, then they deliver the patrons to their floors. Everyone not on the ground floor... is stuck forever.




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