Minor edits to sections I and II

Actually, I feel pretty strongly about this one. This is "An" because it *sounds* like "EL-DEE-R-DEE".  You would never say "a hour before lunch" because it starts with the vowel *sound*. The rule is based on the sound you make when you say it, not the letter it starts with. http://www.quickanddirtytips.com/education/grammar/a-versus-an?page=all