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Sometimes mirrors made of polished (A metal B flags C arms D semaphore) which flashed in the sun were used over long distances.
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Sometimes mirrors made of polished (A metal B flags C arms D semaphore) which flashed in the sun were used over long distances.

User Vissie
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1 vote
I think the answer is metal
User Emy Ferreira
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The answer is metal! hope this helps!
User Kudos
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