Precisely this. Because "readability" isn't "what is this letter": humans interpolate based on context. It doesn't matter whether it's: The Quick Brown Dog Jum

Precisely this. Because "readability" isn't "what is this letter": humans interpolate based on context. It doesn't matter whether it's: The Quick Brown Dog Jumped Over The Lazy Fox -or- Tha Quiek Brawn Deg Junped Ovar The Lasy Pox ... if you're expecting a certain phase, your brain can error-correct quite well. Obviously this might not work where letters are important (say a 24-character software license key), but where words or prose is concerned, what matters is the whole.