Final Fantasy 7 Shinra HQ library question?

The password is different each time you play so you can pay Hart, the Deputy Mayor, for hints or you can just visit the libraries and look for the book that doesn't belong in each one. Match the number on the book with the letter in its title and once you have all the letters, unscramble them to find the password. If you get it right on the first try the Mayor will give you an Elemental along with his Key card 65. You will find the numbers and the section in front of each section. One is Biological something or the other and will have a number like 12. Check the books and you might find something about making a airplane.. that would be the book that does not belong in that section so go to the 12th letter and that is your first letter. It would be best to right them all down and if I remember correctly you can save in this room as well so it would be best after you get what you think is the right answer to save the game before you guess.