Do you know what Dyslexia is?

It is a neurological disorder, unrelated to intelligence, that effects an individuals ability to identify and differentiate images (including letters and numbers). Hence it is most commonly manifested in difficulty reading. For you it may be evidenced by the use of the word "know" for "no" and "present" for "percent"...although of course improper word use is common in the entire population and is not necessarily indicative of dyslexia.