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Yeah, I know. I don't believe in the site you linked. Ask a biomechanicist how many degrees of freedom the human hand has and you'll get a number between 21 and 27... and you have two of them. Throw arms in there and you've got another 6 or 7... x2. Your website only accounts for 16 parameters in its math. Statistically, they've oversimplified the model by a factor of five at least. A system that complex is best developed empirically, not theoretically, which means iterative testing. Iterative testing developed the QWERTY keyboard, less iterative testing developed the Dvorak keyboard. Empirical testing bears out that the QWERTY layout is better.