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Ples is right, we should move north, and try to avoid contact with the zombies. Also, Varya is trying to take the key from the bandit (I don't know about Leila). To do this, she runs around him from the north, avoiding the zombies if necessary.
I would also have Claudia and Leila do the same, especially Leila, but let Ples decide.
After getting the key, we say goodbye and leave.