An inward roll would be the equivalent of typing SDF rapidly on QWERTY. This mimics the way we would normally tap our fingers on a table, rolling from 5th finger to 2nd finger. Try rolling the other direction (index to pinkie). It’s not so easy or comfortable. If you look at my 2nd link (the writeup on alternative keyboard layouts), I show the Colemak layout and give the examples of typing SENTENCE, FRIEND, or FIRST. This is why I paired the braces in the right half of the symbol layer in the opposite manner to the parentheses in the left hand. That way both sides roll inward.
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