by "changing one letter", Im assuming you can change "the non-existant letter place holder" to a letter. In short, make words other than 4 letters.
You shouldn't judge a book by it's cover, instead, you should read every single book to see what every book is about before you even come close to judging its viability.
It's crazy how your life can be twisted upside down inside out and around and you can get sushi from safeway still looking like a normal person — starchild314