The English language is full of connotations, denotations, and various nuances that would not have meaning if it were not for the use of grammar and punctuation.
On the surface, the notion that a study guide designed to help people remember (or learn) confused words or words that have been spelled wrong is an odd thing to read.
On the surface, the notion that a study guide designed to help people remember (or learn) confused words or words that have been spelled wrong is an odd thing to read.