Operational wallpaper on telephone / page 16

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Stylish logo of the iOS operating system

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Humorous picture of computer operation

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Explosion in the field during military operations

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Operating system for smartphones, tablets, e-books

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The picture of military operations on February 11, 1944

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Helicopter rescue operation at the volcano

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Special operation codenamed "this is a helicopter"

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The picture of field military operations

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Fighter combat operations in World War II

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Cobra helicopter in operation in the sky

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Ubuntu operating system in the dark

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Operating system for professionals