Advent of Code 2016 solutions https://adventofcode.com/2016/
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  1. The first floor contains a thulium generator, a thulium-compatible microchip, a plutonium generator, and a strontium generator.
  2. The second floor contains a plutonium-compatible microchip and a strontium-compatible microchip.
  3. The third floor contains a promethium generator, a promethium-compatible microchip, a ruthenium generator, and a ruthenium-compatible microchip.
  4. The fourth floor contains nothing relevant.