Reverse a word

Reverse a Word is a simple but addictive game. The rules: (1) Write a two-letter word. (2) Reverse that two-letter word and add one letter to the front or back to create a three-letter word. (3) Reverse your three-letter word and add one letter to the front or back to create a four-letter word. For example: to - not - tone. Your score is the number of combinations you can think of. With a little effort, you may find yourself on the site's honor roll, which lists the top 100,000 players. Warning: If you start playing, you may not be able to stop.