[jonny_noog]

Hypothesis: the typo "sl" is only common among left-handers.

I shall have to add my vioce to the small left-handed chorus here and say that I too have never had an issue with the "sl" typo. In fact I cannot remember a single occasion where I have made this mistake.

I've intentionally left a typo that I did just make in the above paragraph to illustrate my own tangentially related observation: The typos that tend to occur within my own typing often seem to be the kind produced by one hand not two. By which I mean the typo "vioce" rather than "voice" happened because the fingers of my right hand hit the keyboard in the wrong sequence. Where as typos involving a finger from one hand then a finger from the other (as would need to be the case with "sl" rather than "ls") tend to be less common... for me anyway.