Kennedy refrained from sighing. This wasn't one of his top courses because all the number thing confused him, but he figured that it would do well to come and hopefully benefit him in his O.W.Ls...which he couldn't wait to do.

He made a small dot on his parchment, ready to write down the first of what he expected to be long notes. After that, he raised his hand, "There's the Agrippan, which consists of the letters A through Z and the numbers one through nine," he said, pausing and then continuing, "Then there's the Chaldean method in which the number nine is not used and does not consist in using all alphabetical letters."