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This may be true, but for the sake of discussion, no other tool also includes a second surface that is also intended as a reference to use for sharpening.

And axe, knife, or whatever is a single...

I use 220 or 400 grit wet/dry (used wet) on a flat plate. work the heel of the razor back and forth for a while, then the toe. Apply pressure to either the toe or heel, depending on where you are...