I was stuck on that as well. For reference, this is typing the combination HK on a Qwerty keyboard. I shift my index finger over for the H, and then use my midd

I was stuck on that as well. For reference, this is typing the combination HK on a Qwerty keyboard. I shift my index finger over for the H, and then use my middle finger for the K. Watching my wrists, they don't move at all. I thought the rest of the article and the approach very interesting and rigorous, though, although I thought the text-only effort results of all the different books impossible to grok as text, and would have appreciated a simple chart.