Pokud to byla vražda, potom vrah musel cestou ven hodně šikovně zasklít okna.

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English:

Show your work and conclude with the exact phrasing "Therefore, the final answer is [answer]." where [answer] is just the final number or expression that solves the problem.
user
If it was murder then the murderer must have stopped to do a damn fine job of glazing on the way out.