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serg-157: checking room
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serg-157: ceiling, fluorescent lamp
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serg-157: hall #1, wall
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serg-157: checking room #2
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serg-157: hall #1
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serg-157: elevator
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serg-157: hall #2
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serg-157: hall #2
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serg-157: hall #3
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serg-157: staircase
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serg-157: lobby
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serg-157: wc