anyone good with unix? i need some help on this little quiz thing I need to take..Let me know if you can help..Just PM me

Here is an example:
What command would you enter to see 6-letter words that begin with 'b'(upper or lowercase) and have an 'e' as its third letter?

I believe it uses the grep -i command. I just don't know how to do the third letter as e and the whole command as a whole.