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Let's Ask the Dead Guy

Erik Brisson

Note that the new guy, Roberts, is alone in Tower 1 at 12:10, alone in Tower 2 at 12:40, alone in Tower 4 at 13:10, and alone in Tower 3 at 13:40.

Compute the view of the five prisoner floors from Roberts' vantage point at each of those times. This requires projecting the floor maps into the guard's perspective view.

Taken in order, this gives the final answer GILD.