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Using jeans to sharpen the blades is simply not possible.To strop (maintain the edge of) a blade you need access to both sides of the blade(s) and that is not possible with a cartridge razor. Keeping the cartridge dry between uses will prolong the useful life of the cartridge.
An image is inverted when it passes through a lens. So the smartphone has to display the image upside down for it to project right side up. You have to get an app that stops the smartphone from auto rotating the image.
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