869. You must evacuate crewmembers from a space filling with smoke. The primary means of escape is blocked by the fire. What fire control plan symbol, in illustration D039SA below, designates the secondary means of escape?

869. You must evacuate crewmembers from a space filling with smoke. The primary means of escape is blocked by the fire. What fire control plan symbol, in illustration D039SA below, designates the secondary means of escape?
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