difficulty/strain in reaching or pressing
https://gyazo.com/aa06bc44b3c28d6cae20c26856cc446e
https://gyazo.com/08aafd5ed0a8410df891a3e4cc7831da
Workman (keyboard layout)
を実装するために制作された、打鍵コスト表
https://workmanlayout.org/#back-to-the-drawing-board