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 a pity the dictionary has only one definition of beauty. In my world, there are 7.9 billion types of it- all different and still beautiful. — anne27