Question: When not in use the crystal should be covered by a black cloth
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Answer: When not in use, the crystal should be covered by a black cloth.

Question: Qatar photos of Qatar Qatar pictures Qatar images Doha capital of Qatar photo gallery
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Answer: Qatar, photos of Qatar, Qatar pictures, Qatar images, Doha - capital of Qatar - photo gallery

Question: Back communists was a kind of orphanage
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Answer: Back communists was a kind of orphanage.

Question: Electrical design DC PNPNPN
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Answer:
Electrical design DC PNP/NPN