Maybe it’s your keyboard layout? I used to make this typo (ls -> sl) on QWERTY, but I later switched to Dvorak where both L and S are typed with the right pinky

Maybe it’s your keyboard layout? I used to make this typo (ls -> sl) on QWERTY, but I later switched to Dvorak where both L and S are typed with the right pinky. I think it slowed me down enough on that keypair that it never happens anymore.