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Why is it that if I write over a permanent marker with a dry erase marker on a white board it will erase both markers when I can't erase the permanent one on its own?

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Why is it that if I write over a permanent marker with a dry erase marker on a white board it will erase both markers when I can't erase the permanent one on its own?	3
How slowly can a airplane travel while still maintaining the same altitude?	1