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When it was created
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When it was created.
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When it was invented
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They were invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented
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When it was invented